Earlier quoted context omitted.
While that seems like it would be true, is that really relevant to Debian? :)
The person making the post is getting paid by Ubuntu.
sure some are also payed by a foundation. Which is also payed by companies but with a degree of decoupling of influence.
and some pay them self, e.g. fully voluntary work, but most dev can't afford to do so on a long term, high time commitment manner. So a lot of major changes and contributions end up coming from people directly or indirectly "payed" by some company.
and that's pretty common across most "older, larger, sustainable and still developed OSS"