The wheel does its bit but I think it's also geometry-relatred: the shorter fork + smaller wheel give the Guerilla a smaller headstock angle / less rake & trail. The top yoke is a different number to the Himi too, so they might have played around with that to boot although on pictures they don't look too different, could be to accomodate a different wheel/tire width...
Anyway, I'm not surprised the Guerilla is agile to the point of feeling twitchy (to some). I test rode a Kawasaki Z500 in 2024 and it too turned in very eagerly, in fact it caught me off guard every other corner and I had to put the bike upright to avoid hitting the kerb or the centre of the roundabout on more than one occasion. The bike was such a hoot, it was that very ride that made me realise I wanted a smaller bike!

The Guerilla has a longer wheelbase but has the forks even more upright. If the steering angle is anything like the Himi's it should have the turning radius of a well cover

Guerilla owners please chime in?