Does foreknowledge of Cantonese, rather than Mandarin, assist you more in learning Korean?

Question

This r/korean comment answers my question as "yes", but it contains factual errors like "Cantonese is also much closer to Middle Chinese than Mandarin is". This r/linguistics comment and Quora contend that Korean share more phones (or phonemes — which is the correct term?) with Cantonese than Mandarin. Can someone critique that comment please? Any other errors?

Cantonese FAQs

Q: Is Cantonese closer to Middle or Old Chinese than Mandarin?
A: The general answer is NO, since both languages have undergone a lot of change. Phonetically speaking, certain aspects of the Cantonese sound system have undergone less changes than Mandarin has, so in those respects, it would be closer. Nevertheless, Middle Chinese pronunciation is still a long way from Cantonese pronunciation. Certain vocabulary has been preserved, while others have not. Grammatically, there are definitely differences. If you traced the two dialects back to Middle Chinese, you will find that both have undergone significant change.

Answer 1

You wouldn't notice any difference in grammar, but you may find pronunciations of Sino-Korean words to be easier to recognize given knowledge of one or the other, which can help with the speed of vocabulary acquisition. You can compare Sino-Korean pronunciations with Mandarin and Cantonese pronunciations at https://en.wikipedia.org/wiki/Sino-Xenic_pronunciations#Background. At a glance, Cantonese shares consonant finals with Korean while Mandarin vowels are a bit more similar, with a small overall advantage to Cantonese.