No, "on record" means a year that we have recorded. The year 700 BCE is not "on record", but 1970 CE is.
While the author of the comment was trying to imply that it could get worse, actually they are correct in the other direction. Meaning that if the weather turns cooler (like from a volcanic eruption which releases a lot of particles into the upper atmosphere), then it will no longer be the hottest year.
That sounds about right. July was the hottest I've ever experienced. It was a month of heatwaves. It sucked lol. Not to mention, all the forest fire smoke, so you couldn't run AC without smoking yourself out. It was "great".
ACs have filters though? The filters are also replaceable, and sometimes you can get a better grade filter (advertised for people like hayfever sufferers). I would look into it before next summer...