To suggest it is an optional strategy is ridiculous - there is plenty of brain research to show that this is absolutely not the case.
What people here are doing is saying that for some children phonics is not the best way for them to learn to read. This is a child who is trying to learn by phonics and for whatever reason is not picking it up, so surely it is better to try a different method than keep plugging away at the same one that isn't working?
This would be a little like me saying I always switch the computer on by the little button on the front. Therefore because that works most of the time I am going to keep pressing it despite it producing no results. If however I follow the cable back, I may discover that it has been unplugged. Once I plug it in, I can revert to pressing the front button and it will now switch on.
Until I'd put the plug back into the socket, no amount of pressing the on button would work.
In the same way, helping this child to learn to read by looking at other possibilities may open up the world of reading to her and enable her to then go back to phonics later with the confidence of being able to read, and use her reading ability also to help her understand phonics.
And after all, when I was at school, we all learnt by whole word recognition. We all had our little tobacco tins (!) with words on, which we'd use to remember them. Later we came to phonics and used them to work out words we didn't know, but learning the words enabled us to get a long way into reading (I told upthread that I was reading Lord of the Rings, when I got it).
Now research has shown that on average more children learn through phonics. And that is true. However when I was at school children did learn to read through whole word recognition, and you cannot dispute that the majority of children did learn to read.
And some children will not learn best through phonics.
So it is an optional strategy. It is one that the teachers are advised to follow because it has the best outcome for the most children, but anyone who says it is the only strategy that can possibly be used is wrong.