> This implies these specific people in the developing world have access to a US bank, in which case they aren't exactly the people meant when referring to "financial inclusion".
No, it implies they (or a person they're informally swapping their crypto for cash with) have access to a bank which accepts inbound wire transfers in USD, which is pretty common in economies with weak local currencies, as pointed out above with the example of Sri Lanka. That's a larger, less rich and less American set of people than those with access to a US bank account (who appear to be able to continue to use ACH for withdrawals for now).
Or to put the "quiet part" yet another way, cryptoenthusiasts were suggesting quite different things about numbers of developing world people using crypto (USDT even!) as a store of value when a platform wasn't rugpulling a major cashout route for them...