Regardless of what you think of Makary's original opinion, there's no universe in which a prediction of the future from a medical expert should be labeled misinformation. If that's the bar, then ~all of the statistical models used to make scary predictions about Covid are also "misinformation", as are 95% of the things Anthony Fauci says on cable news.
"Politicians are holding children hostage in the basement of a pizza place" => clearly incorrect factual statement.
"I think that Covid infections will be far below their current numbers by summer" => opinion about the future.
(Regarding the particular claim advanced by health feedback here: it's a "fact check" based on a single paper, written by Neil Ferugson's group, that attempts to validate the predictions made by...Neil Ferguson's group. There have now been many others that say the opposite [1]. At the very least, you'd hope that a reputable "fact-checking" site would discuss these to present a balanced picture of the debate. Health feedback doesn't bother.)
[1] https://www.aier.org/article/lockdowns-do-not-control-the-co...