can you play with savefile now?

i havent played this game like 2months, i wanna know if i can create new acc amd make profile private and use savefile, because im not gonna play this game legit, thanks

Yea, totally safe.

Ehm.. You can't say it is "totally safe" - because noone knows if it is safe atm or not. What we can say is that none as we know of has been banned lately with safefile editing. They can be saving up for a banwave - but we just have to wait and see.
Hacking is never "totally safe".

I've heard multiple ban reports of using another's save file. But, I think that's just because it had hundreds or even thousands of items.

Just be safe about how many items you add and you should be fine.

You need to be sure that the user id in your save matches the one attached to your account. Injecting a save with someone's else's id is probably the easiest way to get flagged for a ban.

It's safe in that the hack itself cannot currently be detected. The way you get banned is by injecting a save that has really obvious discrepancies, or through user reports. Even then, their system has to have some indication that your save was modified for those reports to matter.