Early Career Publishing strategies? (Keep publications to a minimum before tenure-track job?)
I read that whatever you publish before beginning a tenure-track job does not count towards tenure,


The first part may be formally correct at some universities, but this restriction is impossible to enforce in practice.  Your reputation has a high-quality researcher doesn't depend on only your faculty publications; it depends on all your publications.  The people who write your tenure letters will write about your best work (in their opinion), regardless of when you published it.  Pretending that your pre-faculty publications simply don't exist would be stupid, even if it were possible.

A much more accurate statement is that your tenure case will focus on your publications since being hired as an assistant professor.  Faculty publications are more important, but that absolutely does not mean that pre-faculty publications don't matter at all.

(I am assuming a reasonable tenure process, where the committee actually makes a good-faith effort to assess the quality and impact of the candidate's research record, as opposed to merely counting CV bullets.  Sadly, some departments are stupid.)


  so it might be wise to wait with those publications until a tenure-track position is reached.


This is absolutely wrong.  Competition for tenure-track faculty positions is fierce—a typical tenure-track position, even at a mid-ranked department, attracts hundreds of applicants.  Submitting anything but the strongest possible application is foolish.

Candidates for tenure-track jobs are judged primarily by the quantity, quality, visibility, impact, and reputation of their research record.  All else being equal, applicants with more good publications are much more likely to be hired than applicants with fewer good publications, not only because they have longer CVs, but because they can attract stronger recommendation letters (because the references have more research to talk about).

Normally, of course, all else is never equal, but here I'm comparing your changes if you publish more versus your chances if you publish less.

In my experience*, getting a tenure-track faculty position is considerably more difficult than getting tenure.  Most PhDs do not get faculty positions; most assistant professors do get tenure.  Worry about getting the tenure-track faculty position first.

(*I'm a full professor at a highly-ranked American computer science department; I've written dozens of tenure letters and have many years of experience on hiring and tenure committees.)