"ND looks uneconomical so far, but is close to open pit level &...

If you think just because a bigger company bought a small stake a while ago (and the share price has been below their original investment price for most of the time since) means anything and is your basis for investing here, then you need to educate yourself.

Here's 2 articles where the largest mining companies in the world made disastrous decisions losing billions despite having the best information and supposedly the brightest people in the business:
https://www.copyright link/companies/mining/new-deal-puts-billion-dollar-value-on-bhp-s-nightmare-nickel-mine-20210520-p57to7
https://www.reuters.com/article/us-rio-idUSBRE90G08D20130117

"ND looks uneconomical so far, but is close to open pit level & appears to be getting shallower as it gets extends. If the strike gets shallower, it could be economic as a whole."
Nope, its actually the opposite, look at the plan view, they have been drilling for extensions towards the south where it gets deeper and appears now to be closed off.

"As for whether its overvalued, tell me some other explorers with hits like these that have better prospects at a lower MC?"
Resources aren't about individual holes as the experience at ND has shown, there needs to be 'continuity' of mineralisation along strike and/or at depth to build a sizeable deposit, not just a couple of closely spaced high grade holes.