Personally, I would not base a policy change on a single study/article. Do a full literature search.
I note that this article suggests further studies in its final paragraph.

Hi, our IPC team are also having a lot of challenges from staff regarding nail products especially builder gel systems. We have also been asked to review this article by staff and been asked if we are going to change our policies. This was our response…….
Limitations of the Research:
The published study suggests that gel nail polish does not increase bacteria on nails when tested in controlled conditions. However, it does not look at whether this leads to the spread of infection or affects patient safety in real clinical settings. The study also does not reflect the reality of busy healthcare environments, where time pressures, different hand hygiene techniques, and long-term wear may reduce how well hands are cleaned, especially around the cuticles and nail edges. The overall evidence remains limited and mixed, and national guidance in the NIPCM has not changed, and our Trust policy aligns with and follows this guidance.
In addition, from a practical and governance perspective, it would be extremely difficult for auditors or managers to reliably distinguish between standard nail polish and gel polish in practice. There is also a concern around equity, as not all staff would be able to afford specialist or more expensive nail products. This could unintentionally lead to standard nail polish being used instead, which the article itself indicates is associated with a higher bacterial burden.
For these reasons, the safest, fairest, and most robust approach to protecting patient safety is a blanket policy of no nail products, which provides clarity, consistency, and reduces risk.

I also agree with Karen’s earlier post, the article also suggests that further studies would be needed.

Hope this helps Michael, it is a difficult one to manage with staff.