Ask HN: PostCSS, CC0-1.0, React, patents and commercial apps

Question relates to the use of PostCSS in React. Context: There are lots of plugins done by Johnathan Neal (https://jonneal.dev/), but these plugins are CC0-1.0 licensed. In section 4.a of the license states "No trademark or patent rights held by Affirmer are waived, abandoned, surrendered, licensed or otherwise affected by this document."

Question 1: Is PostCSS thus patent encumbered by the use of Neal's libraries or any CC0-1.0 library for that matter? Question 2: PostCSS can be seen as a "compiler" in that it transmutes CSS source code. Is this seen as a business process, which can be patentable? Question 3: And the use of this business process, the produced artefact (the "compiled" CSS) is shipping that CSS liable for any patent royalties? Question 4: Are there any projects that removed the CC0-1.0 libraries from PluginCSS which I can follow?

Thanks for any insights. The last thing I want to do is to make an app and my employer gets sued.