Yes, that's the difference. Loads of Matrix servers have nothing exposed to index, and steer clear of public rooms, and so wouldn't show up on MRS's stats.
Whereas I literally select count(*)'d from the destinations table on matrix.org, filtered on servers which had been federating in the last week(?) in order to get the specific stats above. (And then count(*) of all time for the 150K figure).
Whereas I literally select count(*)'d from the destinations table on matrix.org, filtered on servers which had been federating in the last week(?) in order to get the specific stats above. (And then count(*) of all time for the 150K figure).