I would contend that HackerRank has done a good job of screening and filtering on this occasion. Given clear instruction, the only skill demonstrated was insubordination.
Seriously, submit your current workforce to this smartass test under condition that they need to pass it to come over to the office tomorrow.
My current workforce had to pass tests much deeper than that. Using database queries, graphs and regex is part of the day job.
Not in this area/location, not in case of this kind of company. I know of cases where the score 67% was too low (2 tasks on 100%, 1 task 0% but missing couple lines of code for 100% solution). It's basically partially automated filter with non-technical people sending rejection emails based on score in the list without digging into solution. I gave up on it not from arrogance, but based on experience.