Wikipedia had a really good year in 20-21, their most recent financial report.
They took in $162 million, against an $111 million operating budget, and came out of the year with $240 million in assets.[1]
So they had about half a year's surplus, and wound up with ~2 years worth of savings. And yes, that's a simplification, a good chunk of those assets are necessary to continue operating and cannot be liquefied to cover operating expenses.
In 19-20, they took in $120 million against a $111 million operating budget.[2]
[1] https://upload.wikimedia.org/wikipedia/foundation/1/1e/Wikim...
[2]https://wikimediafoundation.org/about/annualreport/2020-annu...
So, yes, Wikipedia is doing well - as we should hope they would be. But no, they are not rolling in it, and yes they do depend on our continued support to continue doing well.
Edit: The article linked in the tweet asks valid questions and puts the stats in better context, but the twitter thread presents the numbers in a way that is very, frustratingly, misleading.