> Wasn't this after their entry into the index?

Yes. Then rules were changed. Then they were unchanged.

S&P is explicitly a committee-based index. It's not hard and fast rules driven. (Russell markets itself as being super duper rules based. It's a good niche. It's also so wildly complicated as to be, in practice, at least to me, indistinguishable from the committee-based method.)

Elon undoubtedly tried to corrupt this process. But there were loads of non-corrupt reasons to look at a few trillion dollars of market cap hitting the market and ask how that should impact how various indices are calculated. The answer we've come to, that the tech and total-market indices should reflect the change while large caps should not, is a pretty good one.