Maybe these were identified as the "New 450 Himalayan"? Bajaj is an Indian company after all...?
https://www.cycleworld.com/story/motorcycle-news/new-triumph-singles-spied/Duo of new 500cc single models spotted undercover in Spain. By Ben Purvis, February 3, 2022
Shortly before the coronavirus pandemic threw the world into disarray, Triumph had announced a tie-in with Indian firm Bajaj to create new engines and bikes in the 200cc–750cc class. The first fruit of the partnership has long been expected to emerge in 2022, and right on schedule, Triumph has been spied testing two new single-cylinder machines at the firm’s test facility in Spain.
With an estimated capacity of around 500cc, the bikes are expected to be manufactured by Bajaj in India to directly compete with the likes of Royal Enfield and the newly reborn BSA brand, owned by Mahindra. Meanwhile, the bikes will form a new entry-level step in the Triumph range worldwide, slotting in below the current cheapest models—the 900cc Street Twin and the 660cc Trident triple—to give younger, less experienced riders the option to get on a Triumph earlier in their motorcycling lives.
The two machines spotted in Spain are very clearly based on the same set of components. The engine is a single that appears to be directly related to the existing 900cc and 1,200cc parallel twin used in the Bonneville and related models. The engine’s side covers and even the bolt patterns around them closely match the Bonneville twin, but there’s clearly just one cylinder here.
It’s a sensible shortcut to a smaller-capacity engine. Using the Bonnie engine as a template means things like the combustion chamber shape, intake and exhaust porting, valve sizes, cam profiles, and piston design can be informed by the existing design, potentially even carrying over some common components. For instance, it’s quite possible that the valves and piston in the new single are shared with one of the iterations of the Bonneville twin. Ancillary parts like the water and oil pumps might also be able to be shared, and perhaps even some transmission components.
Rumors have long suggested the first new Bajaj-Triumph machine would be a 500cc single, and this certainly appears to be that size. With one cylinder of the Bonneville engine in either 900cc or 1,200cc, 450cc and 600cc capacities would be easy to achieve, while adding slightly longer-stroke cranks could turn those into more category-conforming 500cc and 650cc machines.
https://www.visordown.com/news/new-bikes/new-lightweight-triumph-motorcycle-spotted-uk-roadshttps://www.topspeed.com/motorcycles/motorcycle-news/the-unstoppable-rise-of-triumph-continues-with-new-range-of-single-cylinder-models-ar194592.html