Maybe, most indexes do not have to follow the index. they just need to match the returns. An index fund manager has choice of what stocks to buy. However an index fund doesn't have enough managers to make many choices and so they normally buy just what is in the index. However all index fund managers know they are large enough that if they change their holdings "instantly" when the index it self changes the market will collapse and so the fund will under perform. Thus index fund managers are always trying to figure out what the index will do so they can start buying/selling stocks in smaller amounts before the change happens.
How each fund handles this is up to the managers. (and "total market" funds have less ability and need to do this)
Just look up the performance of Mutual Funds vs S&P500.
This is a great technical point, and in a scenario where a constituent has a lot of obvious correlations it might be relevant, but when you've got something that is effectively a meme stock with erratic leadership and a huge range in possible outcomes from bankrupt to most valuable company ever in the universe [claude tells me I should say 'idiosyncratic returns' instead of this rant], I don't see how you promise to match the performance of an index where it's a significant component except by buying it.
Typically managers pay is such that they don't get awards for guessing correctly, so they won't get any upside from a correct second guess, and they will see downsides from incorrect guesses.
Also unlike traditional funds, there are not enough managers to follow every company, so they can't pick stocks that will win just because they don't have enough to time research the stock. When they pick a stock they are just looking at the high level will this company perform like the other peers in the industry long term.