Earlier quoted context omitted.
Your first link's sample pool was high schoolers and young 20 y/os - people who haven't had their brains fully form yet (which happens around 25). Further, it was funded by the Australian department of health, so ehhh who knows what sort of biases exist there. I can't even open your second link. Picking sources from a Google search generally doesn't help to back up whatever point you're trying to make fwiw.
Here's what his second link landed on, for me: https://accp1.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/...
That study tested the effects of withdrawal within long-term users, and the cognitive impairment resulting from that, over 28 days of abstinence.
From the conclusion:
> It is unclear whether these deficits might be attributable to a residue of cannabinoids in the central nervous system or to withdrawal effects from abruptly stopping cannabis, although both factors likely contribute. In any event, our data suggest that these deficits are largely or completely reversible after 28 days of abstinence.
So, this study found no evidence long-term permanent cognitive impairment, which does nothing to prove the point the person who posted it was trying to make.