I think you're missing the point of the message you're responding to, perhaps because they accidentally chose an example that is unlikely to cross a DST change.

I think you're missing the point of the message you're responding to, perhaps because they accidentally chose an example that is unlikely to cross a DST change. What I think they're saying is that if you don't take DST into account at all, you might decide that "8am on Tuesday" will be using the current offset from UTC rather than the offset as it will be on the given day, whether by that logic or by adding multiples of 24 hours in similar cases.