You cant save stuff to VBO's before compiling.
I would just use assimp and load some file format and save the data I need in binary form which is very fast to load.

Pretty sure that's what he means -- so instead of parsing an ASCII OBJ file at runtime and filling in your VBO, you simply memcpy your binary file straight into your VBO without any parsing or processing required at load time.

You cant save stuff to VBO's before compiling.
I would just use assimp and load some file format and save the data I need in binary form which is very fast to load.

Pretty sure that's what he means -- so instead of parsing an ASCII OBJ file at runtime and filling in your VBO, you simply memcpy your binary file straight into your VBO without any parsing or processing required.