The link you offered does not seem authoritative.

I think a PHD in comparative literature is more than authoritative enough.

brians.wsu.edu

The quote was from a series of entries entitled “Common Errors in English Usage”

“Sometimes I don’t always feel like jogging” doesn’t make any sense.

Makes perfect sense.

I’m sure it makes sense to you, there are many people that make that mistake.

Here’s another link. I’m still waiting for any link that shows sometimes can mean always.

beedictionary.com/…/sometimes_not_always_vs_somet…

Expressions like “not always,” “don’t always,” and “aren’t always” overlap in meaning with “sometimes,” but don’t belong in the same phrase with this word—they’re redundant. “Sometimes I don’t always feel like jogging” doesn’t make any sense. Say either “sometimes I don’t feel like jogging” or “I don’t always feel like jogging.”