The blog is perhaps well intentioned but not really accurate.
The EPA mandates a closed fuel system (and closed fuel containers), the only additional moisture getting in the system is trivia, it's mostly coming from the necessity to draw air into the tank during operation so there isn't a vacuum the engine is pulling against.
It's far better to have that moisture absorbed than have it sink to the bottom, being heavier than fuel, and rust the tank out.
Manufacturers have been using materials immune to ethanol for many years. Vaguely claiming Consumer Reports feels otherwise is inaccurate and dated anecdotal info applying to equipment 30 years ago.
The blog is correct that ethanol fuel decays faster, so it is good to not let it get old whether sitting in the engine or a gas can before placed in the engine.
The blog has it backwards stating that ethanol is a problem in old engines where it would act as a solvent to clean varnish off. It does a very poor job of that so it's an unfounded statement (is why there are detergents in gas too) but if it did do that well, it's exactly what you would hope would happen, to clean the varnish out of the carb because that's the first area that's going to be a problem if varnish builds up too much, long before you have fuel or carb rust out.
On the contrary, one of the best things you can do to an aging carb'd engine based piece of equipment is put a good dose of fuel system cleaner in it to clean the varnish out. If that is enough to finally clog up a carb that's just as varnished, it would have needed a carb rebuild soon enough anyway and then you have a cleaner better flowing fuel system.
Unlike people who say don't flush or change very old car transmission fluid because it can make things worse, a carb on small-medium equipment is a different matter because it's cheap and easy to remove and clean a carb compared to rebuilding a transmission, then you reset the viable lifespan of the carb while running ancient fluid in an old tranny is about end of life expenses for a vehicle.
The author of that blog is merely a writer doing his best to regurgitate bits of information. He hasn't been hands-on using equipment nearly as much as doing marketing and *manufacturing* content.
Things have changed. Once E10 became the ubiquitous fuel, equipment was necessarily made to handle it. Don't put E10 in something 30+ years old.