If people want to chime in and tell other people how thing "can’t" work, then why chime in at all? If you have an explanation WHY, then share it and move on.
The same goes for everyone else that chimes in to explain everyone else’s ignorance or usually just calls everyone a liar. Their opinions and 5 dollars will get you a cup of coffee.
As a matter of general principle, the onus is placed on the person making a claim that in fact the claim has merit and has general application. This is a positive claim.
Others may then show cause as to any reason they may have doubt about the positive claim. This rebuttal may question any number of substantive and material facts that the claimant may make in support of their claim. Should this raise any doubts, the person making the claim is free to clarify, or seek to provide further information.
This approach is somewhat different to any claims that any tweak does *not* work. This is the scenario in the provided quote (roughly - the issues there are perhaps inadvertently conflated if you have read this far) and is an entirely different matter, and as some may know, it is tricky to prove a negative..