[progbits]

HV probably means horizontal/vertical. You can see the CAD tool snapping to H/V line several times in the demo video and they intentionally make it crooked. Same with circles, if you draw it similar size as previous feature most CAD tools will snap and highlight adding equality constraint.

Honestly the demo is both convoluted and not convincing, but also trivial and I don't see where AI comes in. The HV feature can literally be `abs(angle-90deg) < 1deg`. And randomly adding constraints without deeper understanding is how you end up with poorly constrained geometry that won't work once you change design parameters.

[lima]

The hard part is not backing yourself into a corner with the feature tree over time. Takes a lot of practice to avoid, and that's something AI could help with. Meanwhile, what their demo does is trivial.