I don't think Lewis is trying to play games etc. with his compliments on Bottas. I think it's a combination of things. Except for Heikki, he's generally had team mates that have either sought preferential treatment as a rule (Alonso) or team mates who have recognised that they're not as naturally talented, quick as Lewis and their only chance to beat him is to work twice as hard and try, build rapport with the team and mentally destabilise him (Jenson, Rosberg). So to have a team mate that is, especially in comparison to his recent memory with Rosberg, is matter of fact typical Finnish and doesn't play games, is probably quite refreshing.
I think however there is a lot of truth in that the quotes do show that Lewis also isn't threatened by Bottas. I suspect that while Bottas is new to the team and improving by getting to know and work with his engineers, except for those shocker races he's generally been happy with the car and the tyres. Whereas I suspect Lewis knows that he himself is not getting the best out of the car and tyres. So probably in Lewis' mind he's probably rationalising that this is Bottas performing at 90-95% (except for the two really crap races where he was nowhere) whereas Lewis probably feels he himself hasn't gotten on top of the tyres fully yet and feels like he's only at 80%. So if he can get on top of the car and tyres, and I guess he is backing himself to be able to figure it out, then he should start to dominate soon.
Time will tell though if that's an accurate assessment by Lewis. There's no doubt that Lewis knows where his own performance is at and what his potential is. Where it's possible he could be wrong is what Bottas' potential is. But I suspect he's correct. My thoughts are that Bottas is a strong driver, probably just as quick as Rosberg and more mentally stable. But I suspect he's not capable of pulling out the miracle performances that we've seen Lewis, Alonso, and Seb pull out every now and then and I also suspect that his race craft/wheel to wheel isn't on the same level.