Is it worth posting reproducibility studies
Yes, publishing reproducibility studies is encouraged:


It helps the research community determine whether the original study is valid and reliable.
It helps other researchers or students reproduce the study themselves, in particular in order to improve or build upon it.
It benefits your reputation: people might cite it, and it will be taken into account when you apply for a position or a grant later.
Some conferences/journals in ML encourage submitting reproducibility studies, so you might even be able to get a peer-reviewed publication out if it.