I’m not very good at Twitter.
I looked for the tweet “John Hopkins prof article predicts tenfold case increase per week (not testing, actual cases)” on Lookner.
I reviewed his tweets from March 9 and 10, but could not find.
Let me look.
It looks like he did not post it to Twitter—I will be on the lookout for it.
While I was hunting for I found an excellent basic Johns Hopkins article:
https://ourworldindata.org/coronavirus