The person you're replying to is not describing skimming, they're describing reading instead of "sounding it out".
Your technique seems able to help people who likely learned to read with a ruler hiding upcoming lines, or with a finger pointing at the word they say aloud, and people who read with subvocalization.
Such readers generally process text at not much higher rates than speech, and often prefer audio books or YouTube which add visuals or emotion since reading holds no particular advantage.
Other readers take in chunks of meaning, mapping from word form sequences to concepts without going through phonics. It's not skimming. (It's possible it's the same pathway but subconscious instead of aware of the tracking and subvocalization.) These readers can still play back the individual words, with the same recall accuracy as the word by word or sound by sound readers. For these folks, audio books and YouTube are an excruciatingly slow way to transfer information.
These faster readers are "close reading", not skimming. They are reading every word, but mapping word shapes into phrases at a time (perhaps similar to how LLMs can correctly answer completely typo-garbled questions).
The difference between these methods of reading is at least 4x and often 10x or more speed with the same or better concept learning and recall.
Your method is clearly (pun intended) able to assist those who would 'need' the ruler or fingertip to go sound by sound or word by word, with crossing end of line to start of next. (Likely similar reasons some folks read web pages successively highlighting lines with their mouse; your approach would likely help them too.)
But as you're seeing in these comments, it generally brings sequence absorbers to a crashing slowdown.