"before I got the NAS I spoke with Lacerte support about a few issues and they told me that the system would warn me about read only when on a NAS as well"

It's not surprising that we get wrong answers from Intuit's various customer service calls. As a consultant for QB, I can tell you this happens all the time, and is why I stopped participating in their Live Community as an All Star.

"Network Attached Storage (NAS) drives are not supported" from here:

https://proconnect.intuit.com/community/help-articles/help/2019-lacerte-system-requirements/00/4585