In most case, I wasn't sure either. But for some case, like Riry Hosho, I literally witness her tits getting bigger and bigger throughout her AV career. I still love Riry Hosho, because her fake tits look good and natural for me.It is no exactly the same opinion because I care it it is fake or not... In the case of Remu Suzumori I wasn't sure they are fake, but Restaurant says they are... So it is not a case of "I don't care" but a case of "I am blind"...
Her tits are more tolerable and natural than Emi Fukada for example, She is a turn off for me so I don't download her movies. With Remu and others maybe they are tolerable, but I care because I think about it when I watch the movie...