Probably not, but if, in the middle of trying to diagnose my car, someone pointed to the muffler and said "I'm not sure what this thing's for." I probably would look for a second opinion on their diagnosis especially if it was "there is a major manufacturing defect in this model of automobile". It doesn't matter if the problem looked like it was staring us in the face.

Obviously I can't spot any major flaws with what the writer put together after a single read or I'd be pointing them out. I'm not calling it wrong. I'm just saying I'd want more verification from someone that has a better understanding of networking concepts to make it less likely that basic mistakes impacted the outcome.

If the write-up has given you enough confidence, all the power to you.