It's not, but seeing how I get accused of all kinds of things here by now and people have started swarming my DMs on Twitter, here y'all go — but one of you better put it on Libgen:

https://en.wikipedia.org/wiki/International_Encyclopedia_of_...

Seems I recalled the price wrong - over $600, apparently.

And here, links to two reviews of the first edition:

https://onlinelibrary.wiley.com/doi/pdf/10.1002/%28SICI%2910...

https://onlinelibrary.wiley.com/doi/pdf/10.1002/%28SICI%2910...

Also, here, a slide deck about the second edition:

http://benking.de/systems/encyclopedia/BBK-Saur-Library-Fran...

I hope the third edition comes around at some point...