I cannot think of any plausible way in which Apple could have influenced the date of this announcement, but the timing, given what is expected to be announced later today, is uncanny.
[1]: https://trends.google.com/trends/explore?date=all&q=top500
Pretty much a GPU alike stuff with arm-8 set to be able to run its OS.
PS This is meant to be sarcastic.
This seems unlikely unless Apple has decided to sell their chips for the first time ever.
I suppose it could be interesting from Apple's PR perspective, but I have serious doubts that the supercomputer owner would agree to this. What happens to them when Apple discontinues the current chip in favor of the next one?