Not sure if they count, but the site appears to be missing loads of British star-forts built around the great lakes, st. lawrence, and eastern Canada!
https://en.wikipedia.org/wiki/Citadel_Hill_(Fort_George)
https://en.wikipedia.org/wiki/Georges_Island_(Nova_Scotia)
https://en.wikipedia.org/wiki/Citadelle_of_Quebec
https://en.wikipedia.org/wiki/Old_Fort_Erie
https://en.wikipedia.org/wiki/Fort_Anne
They built these things _everywhere_, probably a good part of what bankrupted the British Empire!
And Casa Loma is only a castle in the same sense as the one at Disneyworld. These may be textually and superficially similar to historic castles but are completely different. A knowledgable historian would not curate this list. The author should indicate this is just a technical demonstration.
It’s missing the extensive Napoleonic-era Western Fortifications on the opposite side of Dover from the much more famous Dover Castle.
https://en.wikipedia.org/wiki/Dover_Western_Heights
But to be fair they’re much less well known, and quite well concealed, and are partly on private land, with big fences, cameras and scary warning signs. Tourists don’t seem to be much interested in post-medieval fortifications.
It's probably somewhat regional, as the ones in Canada seem to have pretty good tourism interest, especially when they're right inside a city like Quebec and Halifax.
But we're also very starved for true "Medieval Castles" like Europe or east Asia, so we take what we can get!
I imagine they only downloaded whatever was tagged as "castle" in wikidata. Compare these two:
Bran Castle: https://www.wikidata.org/wiki/Q390275
Citadel Hill: https://www.wikidata.org/wiki/Q321867