Yes, a new post in this same thread.
The reason for that advice is because old posts that have been edited don't show up as new posts, and those of us that often browse for things to help with will likely not see those edits since there is nothing new to follow up on.
When asking for Diagnostics, I almost always say:
"Go to Tools - Diagnostics and attach the complete Diagnostics ZIP file to your NEXT post."
I say NEXT so people won't put it in a previous post, and I say ZIP because many people apparently have their browser configured to automatically open ZIP files, and they seem unaware that they have even downloaded a ZIP. They then proceed to attach all of the individual files in the diagnostics separately. I always just delete all those and make them do it over. Too much trouble to download them separately, and they are much easier to work with in the folders within the ZIP.