They were commenting about their personal feelings, as am I. Neither of us have stated we think YC will do badly because of it.

On the other hand, while I don't think it's bad enough for YC to suffer massively, they have presumably been helped in the past by having a strong following of techy people who just like YC and who assume that a startup funded by them is likely to be interesting. Will they lose that reputation, and if so will it matter to how successful they are? I've no idea, but it's not impossible.

Because it implies interest in what these startups do.

The OP only said it seems that YC companies became less interesting over the years.