Earlier quoted context omitted.
Doesn't this imply that, had your friend not taken your advice, he would have failed and thus been an "obvious fraud", but a mere 3 weeks transformed him from fraud to competent programmer?
The leetcode test is just a screening device. Passing it means you then go through the real interviews. Also, if someone is unwilling to do the work to pass the leetcode test, they likely don't have the ambition to get the high pressure jobs.
What absolute drivel. I've done plenty of leetcodes. I don't care about writing a qsort algorithm, I know the trade-offs, unless you're working for a FAANG or FAANG-adjacent company, the need to write your own sorting algorithm implementation is probably zero or near zero.