Kawhi has been in home games, he even sat on the floor to look those games. Also, most times Spurs players rehab in SA and don't travel with the team until there are very close to play which it's not Kawhi's case.
I doubt Kawhi didn't communicate with the team at all.
Some players already said he called and texted them, obviously those players weren't Parker/Manu, there is a whole generation issue there.
You can bet your life that JSimms Danny Brandon know who is Kawhi's favorite rapper/what's his favorite song this year, if you ask Manu he doesn't know anything about it. I mean, knowing a teammate musical taste isn't a thing but can explain the generational issue.
And Pop knows everything about Kawhi. He knew what's Kawhi was doing, where was training since he traveled with Spurs' personnel, he knew what his NYC doctors said because they told him Kawhi isn't ready to play...
When there is a communication problem it's not just about only one part. Both sides have to show interest in improving their communication.