There are some good points here, I suppose, but the writer seems to be inconsistent. The title contrasts apostrophes with quotation marks, while the first image

There are some good points here, I suppose, but the writer seems to be inconsistent. The title contrasts apostrophes with quotation marks, while the first image contrasts the prime symbol with quotes, seemingly indicating that the apostrophe and the closing single quote look the same. The text of the article appears to agree first with one, and then with the other. It is my understanding that the image has it right; the apostrophe is identical in appearance with the closing single quote (in English usage), while the prime symbol is something different. The two got confused, because typewriter keyboards and the basic ASCII set only included the straight marks, not the opening/closing curved pairs.