In your specific case, no, because the labeling is wrong (or you just can't get what you want)
Looking at the photos on HD.ca, it is clear enough that the panel is not labeled for service in the US, as it would either need a cCSAus mark, or a UL mark alongside the CSA mark, in order to be usable in the US as well as Canada.
Generally speaking? I'm not sure
I am not certain if one could make a binational loadcenter assembly that was listed and labeled cULus or cCSAus; it depends on how harmonized UL 67 (the UL standard for panelboards) is with its Canadian counterpart.
As to accomplishing the end goal here...(but you just might be able to get what you need)
There is good news and bad news here. The good news is that it's possible to do this while staying within the QO product line as a whole; the bad news is that you need to use unit mount breakers (and a few jumper wires) to do this because QO loadcenter interiors do not support retaining backfed breakers in arbitrary positions.
- Two QOU3xx breakers (you can go up to 70A for the generator and up to 125A for the utility, wire bending space permitting)
- A QOU1xx breaker to serve as a "dummy" pole (if the utility breaker is 70A or less)
- A QO3HT handle tie (if the QOU1xx is necessary)
- A QO2DTILA interlock kit
- QOUMFS1 threaded mounting feet, two per breaker pole
- 8-32x3/8" mounting screws, two per breaker pole
- Insulated three-port mechanical splice connectors (three) and suitably sized jumper wires (six) to connect the load-side hots and neutrals together
- And a box to wrap this all up in (the box and trim from a QO816L100xx loadcenter should do the trick quite beautifully, just yank out the loadcenter interior, take care of the twistouts, drill some holes in the trim for the 8-32 breaker mounting screws, and fit a ground bar to the box)
What you want to do here is flush mount the breakers to the enclosure cover (trim) in a 3-1-3 configuration (or 3-3 with the utility on the left if using a >60A breaker on the utility side), then mount the QO2DTILA to the left side of the rightmost breaker. Finally, if the dummy breaker is being used, it needs to be handle-tied to the leftmost breaker in this configuration.
Wiring-wise, one side of one 3-pole breaker goes to the utility (hots + neutral), while that side of the other 3-pole breaker goes to the generator. The opposite side of the 3-pole breakers gets wired in parallel using suitably sized jumper wires and splice connectors, and then that can get wired onward to another enclosure (or a loadcenter interior in that enclosure if you're doing more extensive enclosure modifications) to distribute standby power to wherever it needs to go.
As to the 1-pole breaker, if present? It simply is left unwired; its sole purpose in life is to serve as a mechanical adapter between the handle-tie going onward to the left-hand 3-pole breaker and the QO2DTILA interlock as the interlock may slide under a handle-tie space that doesn't have a handle behind it.