To be fair to Automattic, that last quoted line is actually referring to a research project - not their hiring practices...

> For our initial research, we’re looking for women and non-binary people.......

But I understand your frustration. I have 20 years experience and I'm currently looking for a job (considering a recent offer, actually). Age discrimination is real IMO but there's little you can do about it (very hard to prove). Move on, find an employer with more realistic hiring practices. You don't want to work for the discriminatory companies anyway.