I explained it, but Larian working on remake means Larian is not working on dos3/bg4/whatever crazy cool idea they might have in the future.
I didn't read anything in the OP asking specifically about LARIAN being the one making it.
But even if that was the case, Larian is currently a studio counting hundreds of employees. I'm sure they could part people between projects as they wanted and even make new hires, if needed.
