That is really unusual. I don't think Toyworld/Mr Toys has ever had GEN Selects before.
I remember they had a brief dabbling into exclusives with some of the Golden Lagoon figures a few years back, but I can't recall anything too unique or limited since then.
It makes me wonder if they are joining the "fan channel" retailers for future exclusives like JB and EB have been getting, or if this was just a one-off of excess stock that EB and Amazon no longer wanted. (sometimes, very rarely, a small amount of unplanned extra units comes into the country in a planned shipment, and they get handed off to whomever wants them, or whomever already sells them).