If you really must have a PDF at least make a proper web page version first and then link to the PDF as an alternative format for people who really, really want it.
(This pet peeve aside, this is a good document with some excellent advice in it.)
Another problem with PDFs: since they don't particularly encourage having a single, unambiguous URL you can end up with confusing multiple copies of them floating around.
This post links to https://ias.ieee.org/wp-content/uploads/2023/06/2020-01-16_I... - which has 2023 in the file path, 2020 in the filename and declares it to be copyright 2015 in the actual document.
A search for "A guide to technical report writing iet" lead me instead to this document: https://www.theiet.org/media/5182/technical-report-writing.p... - same organization, similar content, different document design. Is this the updated version of that 2015 one? Hard to tell, because it doesn't have a date anywhere.