This keeps the US corpos out of residebtial real estate here right?

Kind of? The definition of a residential real estate in the law is narrow. It's essentially a single detached home. Property that is divided into units aren't considered residential real estate. So foreigners can still buy townhouses, duplexes, apartments, etc and rent them out for exorbitant prices.

Property that is considered "recreational" is also fair game. What is a recreational property? If it could be listed on Airbnb, it's a recreational property. So if a single detached home is nearby a ski resort, it's also fair game for foreign buyers.

Foreigners are also still allowed to buy residential property if they intend to live there, or have a Canadian visa for things like work, school, etc, or are married to someone who isn't affected by the ban.

If it kind of sounds like this doesn't do much to deter foreigners from buying property. It's because it really doesn't. But don't worry! Even before the ban, foreign buyers only accounted for 1%-6% of purchases depending on the province. The greedy corpos buying up all the residential real estate have always been Canadian.