Not speaking for Kilemall. Also not talking about this thread, I'm thinking of comments elsewhere, from when Cepheus first started.
The backdrop for me is I've been hearing "play Cepheus not MongTrav," "play Cepheus so you can use [adventure] or [setting] that's for Cepheus" (as if they weren't compatible) since Cepheus was just the Mongoose 1e SRD with a few house rules in the direction of Classic, and even worse editing than MongPublishing. (And the last takes some doing.)
And then yes, Cepheus has come a fair distance from its first iteration. But its fundamentally still Traveller, they just can't call it that without kicking Marc Miller a license fee (if he were even open to that with T5 and Mongoose fees on the table). But if you can't convert a "Cepheus" adventure to Mongoose or Classic I don't know how you're running games in the first place.
Now Cepheus is more than just the SRD with a few house rules and worse editing, but its also still just an iteration of Traveller, and a compatible one as far as adventures and settings are concerned, and the party line hasn't changed.
That's what I'm hung up on, is the line hasn't changed. The facts on the ground have shifted slightly, to make the line more plausible, but I still remember when the party line was insulting to your intelligence, and the strong form you still see is still insulting to your intelligence. I'm not attacking Cepheus Deluxe, or its associated publishers, but the attitude of your most dedicated and evangelical online fans isn't doing you any favors, and hasn't from the beginning.