@max お待ちになります is 尊敬語(honorific language). It's wrong to use it for 私's action!

I found many more mistakes on their other pages. There were so many that I didn't mention all of them in the comment

Maybe they meant to type 歩きました ?? cos they give its reading as "Kouen wo arukimashita." but it's not 謙譲語

and they give another example 長いお話があります。 as 謙譲語

Only one out of their three kenjougo example sentences is correct.

here bondlingo.tv/blog/learning-the-japanese-keigo-kenjogo

Wow, I'm glad I didn't learn anything from them before posting this question! :)

It's super weird, their pages don't look like they were plagiarized from anywhere, they even cover some topics in more detail than a typical website -- and yet, they are apparently written by non-native speakers with extremely weak language skills...