Regarding the downvotes, the company says the below in their Immunefi page. It seems (as the OP responded) that they paid out differently in this case. I am unsure why that happened or if the page is outdated.
"Payouts are handled by the Sei Foundation team directly and are denominated in USD. However, payments are done in SEI." [1]
The other part of my comment is correct according to the various Immunefi listings. Again, I could be incorrect if they do something differently behind closed doors.