Seems a bit poorly thought out to me. Protestants don’t just look at the Catholics and do the opposite, that is just ludicrous. Protestants still have plenty of customs that are Catholic in origin, but they have abandoned the ones they don’t view as biblically sound. At this point, there are plenty of Protestants who don’t even know what a lot of the Catholic customs are, because they aren’t paying much attention.
As for “reformed Catholics”, this seems like more of a theoretical construct the author wishes existed, rather than a real thing. Catholics certainly don’t view any Protestants as “catholic”, reformed or otherwise. Opinion on the Protestant side about how to view the Catholic church is divided, but generally, they don’t view any denomination as “catholic”. Instead, membership in the universal church is held to be an individual matter, not a corporate one.
Well,the author errs by making a blanket statement not all "Protestants" (whatever that term defines) are like that, however, some are -- and I know a couple personally who did that (now they are back to The Church)
you are correct that there are many non-Catholics who don't know anything about the Church, but among those are many who have perceived (wrong) ideas.
A blanket statement errs. I view Lutherans as close to us in catholicity (I prefer the term orthodoxy)
For other denominations, it depends on specifically which sub-denomination we are talking abotu