My interpretation of "fully remote" is any job, anywhere (unless your physical presence in an office is part of the job).
may have been a semi remote role
Today I see much clearer job postings (e.g., "Anywhere in US, No Canada, must be in CT/ET"). You still have to figure out the billing thing (Contract, FT or Canadian Proxy Entity), but it's better overall I find, likely due to Covid.
These kinds of sites are good for leads, but you still have to wade through the details.