One of the key words in that statement was "actively developed". Cincom, Instantiations, and GemTalk have some great people working on them, but Pharo7 had 75 different people contributing - including probably almost as many full-time people as the commercial developers (maybe more).
I love Pharo, so don't take this as me trying to take anything away. Cincom "actively develops" VW as well. I keep in touch with that side just for my own information. Pharo is doing a phenomenal job.