There are too many marketing falsehoods on this site to take it seriously. It does a disservice to the industry. There are many misstatements and half-truths here that make it hard to know what is true.
If you are asking about line 3, I would say this is pure BS. The site seems geared towards promoting Country stoves which are not bad stoves at all, but that is lost in all the marketing BS. For example: “Certain stoves, such as the ‘Country’ stove line, by Lennox, are designed to hold up for life with repeated over firing.” Hmm, and just why are there multiple warnings in their manuals to avoid overfiring the stove? Oh yeah, then there is this caveat in the manual too: “Damage caused from over-firing is not covered under the manufacturer’s limited warranty.” This guy has more hot air than a popcorn popper.