True, but lets play with the meaning. If WSL did not "create"/"change" something. Would it exist? The answer in this case seems to be no. Without WSL, there would be nothing similar to WSLVT today. As such it is his creation. (This I mean without discussing where it came from, purely meaning of the words)
Play with the meaning? How 'bout, let's not.
"WSLVT" only tells us the lineage the system has been passed down through, not anything about who created it.
There not being anything similar to WSLVT today without WSL would just mean it would have died with YM.
The fact that there is this system today means WSL learned it and passed it on. So there is now WSL-PHB-VT or WSL-DMP-VT, for example. It only tells us the line of transmission.
Plus, I'm not even totally certain he came up with the name himself. It has been said that after his massive seminar in Beijing shortly before his death, participants found his teachings to be very scientific and started calling it "Ving Tsun Kuen Hok (Ving Tsun Combat Science)". The name stuck and China officially recognized it as such.
If that's the case, then he didn't create anything, not even the name.
There is an awful lot of hero worship in DP's speech and writings, with all the insistence upon an "unbeaten record" of 60-100+ blood matches and whatnot. It wouldn't surprise me if he thinks WSL was genius enough to create what actually took generations to develop.
WSL always claimed to have taught nothing more than what he learned from YM though, and that the system didn't need any changes although the BJ form may be open-ended. But that's it.