Does anyone know a different source where we could see the number of unconfirmed below 1 sat/vByte transactions for different fee ranges?
I'd use mempool.space for this:
3 transactions into the future, it's 0.63 sat/vbyte.
7 blocks into the future, it's down to 0.43 sat/vbyte.
Most people would not want to schedule their transaction that far in time, so the <1sat/vbyte fees are so far only looking a little bit useful.