Sure. The way they assembled it is to prevent you from taking it apart.
They used a bolt to secure it then encapsulated it so you can t remove it. Might have something to do with making sure you pay them over 700$USD! for a new BMS (How ridiculous...)
So like you said you have to drill it out.
It took me 2 min to take out.
Just used a 11/64 bit to drill into the hex nuts.
Drilled 2mm deep (Which is the thickness to the aluminium and then gentle use a hammer and nail (or punch if you are fancy, to free the BMS, it is slightly glued to the aluminium).