I wonder how much of the player base Inara represents?
On an extremely crude basis,
https://inara.cz/elite/rankings/?page=3214 suggests at least 241050 CMDRs known to Inara, which would be about 1 in 20 players (ignoring Epic giveaway accounts, closer to 1 in 50 with them). That's reasonably close to the in-game traffic report compared with EDDN data ratio in a typical bubble system (or it was pre-Legacy split, anyway, harder to test now) so it's probably similar people.
The Inara ship stats table doesn't really help much either way for telling how popular the Python 2 is even among Inara users, though; whether they're more or less likely to buy the Python 2 than other players is a separate unanswered question.
(unlike steam, of course ,which insists almost nobody is, which is hilarious)
Steam's figures are perfectly fine for what they actually measure. It's the people who think "current/average/peak concurrent players" and "active players" are going to be anywhere near each other who give them a bad name.
("Not everyone uses Steam" is true, but "Not everyone plays the game for 24 hours a day, 7 days a week" is a
much bigger reason for those numbers to be very different)
until the next report for investors
Which is scheduled for tomorrow, though how much detail it has on any particular game isn't something Frontier are particularly consistent with anyway.