No if they had no problems performing on the job then no it's not an issue. Maybe they learned and this provided a good reset for them. Maybe they didn't and similar issues will crop up.

I put the anecdote up as a real-world example of one way the GGP's github reference can be faked.

You would have to dig really hard into their knowledge of the system to catch them, which you wouldn't have time to do.

For instance, I believe the issues would show up in a benchmark.