At our school they give home 'decodable' books initially, until a child has read all of them in a 'band' or 'level', then - if the child hasn't recently been assessed by the teacher, or has been assessed as not ready to move to the next level - they move on to the old-style ORT books. Chances are this is what happened to your DS, OP, particularly if he has been on red for a little while but still makes regular mistakes in de-coding. I doubt it was a 'mistake' - I don't see how that could happen, unless the mistake is that they have forgotten to remove a few of the non-decodable books when they cleared them out. It is much more likely that they never did clear the non-decodable books out, but rather use them as back-up for when someone runs out of decodable books to read, like at our school.
Can you not just teach him that diagraph?
If it were a one-off, rather than that he will be getting not-yet-decodable books from now on, then perhaps. But even then, it feels wrong to teach a child who isn't confident with digraphs yet, the next step i.e. split digraphs. Like saying 'oh, the child can't consistently add up correctly yet, let's teach him some multiplication then'.
I'd give it a go. You seem to know your way around the principles of learning to read, so the teacher has given you the chance to stretch him a bit at home.
Same problem really. You don't stretch a child who is not yet secure on basic skill A, by challenging them with advanced skill B.
Isn't this a great opportunity to teach him to read the word time?
OP, some DC learn to read almost entirely from recognising the words rather than decoding. In fact, many DC have an excellent memory for words but a poor decoding ability.
These days children are not taught how to read words. They would need to learn thousands of words. Much better to teach them to decode and blend, then they need to learn some 180 PGCs and can read every single word there is.
Many children have poor decoding ability because they haven't been taught phonics properly. This will severely disadvantage them at some point, where their excellent word recognition memory hits its limits, perhaps after a thousand or so...
All reading is good, I agree with looking at it together like you would any other writing irl. You don't go to e.g. the shops and only let him look at the EGGS and MATS but not the FRUIT.
Again, fair enough if it's a one-off. But this child needs to practise decoding, practise applying the phonics he has been taught. This book does not give him that opportunity to practise his basic skills.
I heard children in reception and Y1 read for three years. Much too often, a child was doing well on their decodable books, just not QUITE ready to move up yet - then reached the non-decodable books and was completely thrown. Their phonics skills and, importantly, their confidence made huge steps backwards. Whereas the other children who moved up just before reaching the end of the decodable books, thrived on the new level. My own DS developed bad habits of guessing when he got stuck on non-decodable books for a while. The worst is the confidence. They have learned that these letters make those sounds, and have learned that if they concentrate, they can 'read' - they can turn those squiggles on the page into words. Then suddenly it doesn't work anymore. Instead it all turns into a big mystery and they get told off for trying to guess. I have seen 5 year olds becoming very distressed and saying 'I can't read' when just a week before they were doing fine.