I'll fully admit that the scenario you experienced is probable, given what's in the article.
But the main issue is that Best Buy sell a configuration of this laptop with 64GB of RAM and this fix openly contradicts that such a configuration is possible.
On top of that they "repaired this laptop" by removing part of the product the consumer paid for. If I had a repairman come look at my washing machine and they removed the extra rinse feature because that was causing it to flood but that feature was a stock feature, I would be pissed and litigious.
The fact that they didn't actually inform the customer is also bogus.
It appears to be a bizarre episode where Best Buy ‘repaired’ an under-warranty laptop by simply removing one of its SODIMMs, testing it worked reliably, and then sent it back to the customer with half the memory it originally shipped with installed, confusion possibly caused by a purchase made from a third-party seller.