I tried to like and retweet Paul's tweet which included a link to Substack and indeed I can confirm I cannot like or retweet it. It says "Some actions on this Tweet have been disabled by Twitter."

Good grief .. I went to that tweet and clicked the substack link to reach the essentially text only article.

Twitter inserted a giant scary WARNING!! page with a tiny continue (if you're really sure you can handle the risk) link

    Warning: this link may be unsafe
    https://astralcodexten.substack.com/p/most-technologies-arent-races

    The link you are trying to access has been identified by Twitter or our partners as being potentially spammy or unsafe, in accordance with Twitter’s URL Policy. 

    This link could fall into any of the below categories:

    * malicious links that could steal personal information or harm electronic devices
    * etc.