Nta,the boyfriend fundamentally lied about his lifestyle just to get a fit girlfriend,I'd say drop him immediately.

It does matter. He lied about his interests and expected her to be ok with a bait and switch.
I’m the same, I want someone active and if you lie about that then we’re not compatible anymore. I want someone to go out and do activities with, not just watch tv with. Go to the gym as dates before having a lunch, not laying in bed.
It DOES matter and people make it out to be shallow or whatever but it’s not, it’s shared activity.