Interesting, the 2020 revenue and costs are significantly lower than previous years. Actually the prior years give a much better insight into salaries there. I wonder if this is because they switched from the non-profit model to the for-profit subsidiary at that time?
Which is one reason I suspect it might not be true: not because Block is necessarily honest, but because everyone and their dog has heard of this scam and it's the first thing people would think of.
The twitter thread they published appears to contain supporting evidence. Or perhaps there was enough smoke to justify the short position which they covered at market open for a nice return.