Hi @nomorexl,
Thanks for the question! I’d encourage you to reach out to sales@rstudio.com for more details.
The short answer is no — only real humans who deploy content to RStudio Connect or visit it count against the named user limit. So the person who publishes the Rmd would need a named user seat, but not the document itself.
In most cases, viewers would need seats as well, but there are exceptions for content hosted for public consumption. Reaching out to sales@rstudio.com would be the best way to get an answer for your use case.
It’s also worth noting that you can deploy content to RStudio Connect from anywhere. If RStudio Workbench (a recent rebranding of Server Pro) would be useful to you — that will work — but it’s not required. RStudio Open Source Desktop or Server can also work.