Nah, I'm thinking that it's possible, that Samsung has been testing One UI V5.1 on the S22 series, since the S23 will be running One UI 5.1 out of the box, and will be released in roughly a week or so.
S22 series will be the first device to get the One UI V5.1 update.
Yeah, Samsung DOES make some ???? decisions..... but, No I don't think that you are right about this.
If it's a Canadian device, there's no such thing as a Locked device since December 2017.
The A53 received One UI V5.0 in December, according to Samsung Members Canada.