Absolutely this OP.
I think people are getting the wrong end of the stick thinking this is about "bad blood" or a breakdown in your relationship that needs healing or similar.
If anything, it can be the opposite. Sometimes people want to preserve the precious memories and image of themselves in your mind in happier, stronger times.
That isn't lack of love; it's just a different kind of caring.
People say first impressions count. Well, last impressions count too, and some people don't want to be remembered when their health has diminished. I think this can be more common when, as in your situation op, you have been away and have not seen the decline. For those geographically close to him it comes incrementally; he may well be trying to save you from a shock.
Viewed this way, it becomes about his dignity and his wishes for his memory.
I know quite a few people who say they wished they hadn't seen loved ones right at the end. I don't imagine I would feel that way, but we can never know what a path looks like until we have walked down it, and this isn't an unusual response. Perhaps your father saw someone he loved right at the end and preferred the earlier memories.
For me the guiding principle would always be to respect the wishes of the person themself. Your mum seems to be reinforcing that this is what he wants, there does not seem to be much ambiguity around that, and I think people saying he may not be lucid, knows not what he is saying etc are most likely a bit off the mark with this.
By all means travel to be nearby in case he changes his mind, and there have been some lovely suggestions of ways to write or leave a voice message. But personally I would not be forcing him to see you if, for whatever reason, that isn't his wish. It won't be rejection of you; it's more complicated than that.
I'm sorry you are in this position.