Are we reading the same information? It seems there is a little doubt over how much Healey involvement there was, but the existence of Healey engineering drawings of this car suggest that there was absolutely some connection.
Then again, the drawings I have of the restyled version (which look like a Mk2 Sprite, somewhat) are not from the Healey design office. There still seems to be a lot of confusion about exactly what this car is, but I can't believe Westland had the resources of skills to design and build a car from scratch (even using bought-in mechanical parts) without at least some input from from was, practically, their only employer and main sponsor at that time.
I'd respectfully suggest we add 'possible Healey project' or similar to the title, until it can be proven otherwise