Yes this is from the January sale. SourceForge and Slashdot have been owned jointly for years, our subsidiary is just named SourceForge Media. Notice is just legally required.
Didn't Slashdot used to own SourceForge?
hint: just because the company is named sourceforge it might not be the old website SourceForge.net. it's: sourceforge media llc. ( a new LLC )
It looks like this was part of the sourceforge purchase made back in January and previously discussed here:
https://news.ycombinator.com/item?id=11092219