Yes, it is on the PC World magazine website, in turn owned by IDG, which are well established.
https://en.wikipedia.org/wiki/PC_World
https://en.wikipedia.org/wiki/International_Data_Group

I found this archived version of a now removed page by PC World editor in chief
https://web.archive.org/web/20200809062616/https://www.pcworld.com/article/3562330/exclusive-deal-get-windows-10-pro-for-39-99-thats-80-off-retail.html

PCWorld’s partner, Cleverbridge, is able to secure great discounts by going directly to software vendors and publishers, buying licenses in bulk, and then working with safe, secure brands (like PCWorld) to sell the software directly to consumers. Please note this deal is for an unlimited lifetime license for a single PC.

This reddit post has some speculation about it being a "grey market key", which AFAICT means Microsoft could deactivate it in the future. One person in that thread says they purchased a license and it shows as retail.
https://old.reddit.com/r/Windows10/comments/hynzsl/so_i_purchased_windows_10_pro_through_here_should/

Since PC World has had the same campaign previously, so might do it again later, and since I don't really need a Win 10 license right now I'll pass, but if anyone gets one let us know how it goes.

I don't know how to fix the plugin itself. But you could try an external AutoHotkey script as a workaround. This might do the trick, if I understand the plugin screenshot correctly.

Unless, of course, those programs all support the same standards. And then it's questionable what value using different programs would have.

-JavaJones (August 14, 2020, 06:14 PM)

We could then use one specialized tool (Obsidian) most of the time, with all kinds of bells and whistles (graphs, complex search/filtering designed for the specific file format, ...) but now and then use some other tool (VS Code, AutoHotkey, ...) to access some files and do other operations or formatting on them.

There is a repeated distinction made here between "database" and "file based" ... But as far as I can see a reasonable version of similar functionality can be created using offline, text-based systems with augmentation.

-JavaJones (August 14, 2020, 06:14 PM)

True