Huh?

You can easily verify this yourself.

https://twitter.com/search?q=from%3Amtaibbi&src=typed_query

https://twitter.com/search?q=from%3Acnn&src=typed_query

https://twitter.com/mtaibbi

Edit: Additionally, the Substack thing was at least partially true - I saw it myself on a few links. Some worked, some didn't, so perhaps it was only on tweets after a certain date.

The Substack throttling was not false. It was throttled before the decision was reversed

This takes twelve keystrokes and 3 mouse clicks to verify (including the click to take you to twitter in the first place). Certainly within the capacity of even the most incurious HN readers.