yes, although one more hotel next to the airport is not going to change that. People who are travelling with international flights are still going to want to go directly to Montreal because it’s much cheaper and easier to do
the Hotel that connects to YUL, works because Montreal is a busy hub for both domestic and international flights, and it’s kind of in the middle of nowhere (until the REM connection gets built in 1-2 years). unless you’re flying domestic (which gets fairly minimal traffic) then you’re still going to be driving to Montreal or Toronto in order to take an international flight