In my book that barely qualifies as "self-healing." It's a useful addition, and if it's cost-effective it's worth doing, but self-healing (again, to me) implies more than the technical fact of what happens at the micro-level: it implies a technique that maintains the road indefinitely, or at least...2x? 30 percent sounds more like "more durable due to resistance to micro-cracks".
All that said, I, too, would like to reduce my accidents by 30%. Notably around my weak ankles in soccer!
Biological wounds often heal with scar tissue which generally prevents the situation from worsening, but is still not as strong as the original undamaged tissue or bone.
If it re-manufactured itself, it'd be as good as the original.
This seems a bit like that, leaking the vegetable oil into the crack, as blood seeps and clots into a cut, then the bitumen and aggregate can flow together in hot days unhindered by the ordinary-occurring oxidization. Still not as good as undamaged, but better.
Seems like an at least good-enough term?
Traditional methods of resealing roads are effective when done at the right time. It takes proactive maintenance.
Until this is actually tried in the field in real world conditions I’m not holding my breath for this as a successful method.