I don't quite get this.
kendi - (according to the tips) himself
kendin- (according to the tips) yourself
kendini ( in this sentence) himself
I suppose this must be buffer (n) + accusative (i)
In that case what would 'You love yourself' be? Shouldn't it be Sen kendini seviyorsun. ?
Kendi means 'self'. But third person singular doesn't get a suffix so it is in the same for with 'self'(But it can also be 'kendisi').
Kendini can mean both yourself and him/her/itself (in accusative case).
kendi(self)-n(second person singular)-i(accusative)
kendi(self)- Ø(third person singular)-n(buffer letter)-i(accusative)
And yes it would be '(Sen) kendini seviyorsun.'