I mean, every Russian MBT’s main weakspot is the LFP. The only thing different would be that the BMPT doesn’t have an MBT turret and its harder to disable its weapons. It also doesn’t have a turret ring weakspot (which is sorta unreliable on the T-90M anyways).
The issue comes with ERA and how it functions. It provides way more KE protection than it should (apparently, not sure- i think its main issue is that it destabilises the dart). We also don’t have Anti-ERA Darts so its even harder to penetrate them. Yes you can LFP it, but thats its only real weakness. If you can’t see it, then your best shot is hitting the ammo (which is a much smaller target) and disabling it. Where it can just, drive off and repair.