Not quite correct. For a TRV, the applicant must provide the proof they can support themselves and afford the trip, as well as providing proof of strong ties to the home country. The OP can not sponsor them. They can only provide a letter of invitation and support.
In addition, a TRV does not necessarily guarantee admission into Canada. That is determined by CBSA at the point of entry, along with how long you can stay. The duration of stay is a maximum 6 months, not “at least 6 months”. To stay beyond 6 months (or whatever duration CBSA has granted) they would need to apply for an extension with valid reasons to remain.