This particular one might not be true but the general spirit probably is. This is why I sometimes do things which a drug lord would do even though I am not one (I swear). It's for the benefit of possible-future me where I do have something to hide.
The correlation of the time where you started using Tor extensively and the time a particular Darknet service started operating? Certainly a possible leak of a few precious bits of those ~30 bits that are needed to pinpoint you.
It's a generalization of the rule that you should not restrict encryption to only those messages that are important.