I think we won't know for sure whether aimacode will be in GSoC 2021 until Mar 9. All of these will have to be true:
But if we wanted to guess, we can look at the history of https://github.com/aimacode/aima-gsoc which got updates in jan 2018 (for gsoc 2018) and feb 2019 (for gsoc 2019). Unfortunately this doesn't give us a definitive answer. If it had been updated in 2021 that would be a strong sign that aima has applied to gsoc. But it hasn't. But in 2019 it wasn't updated until mid-feb, so I guess it's still possible that it will be updated in the near future.