Yep, that's right. SkyView + the ADS-B output isn't a 2020 compliant emitter. Fortunately, you'll see that the FARs don't require one until 2020.
To follow the trail (excerpt of the two relevant regs below - the bolded bits are what tie everything to 2020 and beyond):
§ 91.225 Automatic Dependent Surveillance-Broadcast (ADS-B) Out equipment and use.
(a) After January 1, 2020, and unless otherwise authorized by ATC, no person may operate an aircraft in Class A airspace unless the aircraft has equipment installed that...
....
(b) After January 1, 2020, and unless otherwise authorized by ATC, no person may operate an aircraft below 18,000 feet MSL and in airspace described in paragraph (d) of this section unless the aircraft has equipment installed that—
§ 91.227 Automatic Dependent Surveillance-Broadcast (ADS-B) Out equipment performance requirements.
....
(c) ADS-B Out Performance Requirements for NAC P, NAC V , NIC, SDA, and SIL—
(1) For aircraft broadcasting ADS-B Out as required under § 91.225 (a) and (b)—
.....
So, basically, until 2020, there aren't any requirements that you meet the 2020 performance levels, although if you had a certified GPS like a 430W or GTN directly connected to the transponder, you'd pass that test. However, like many things with non-certificated (amateur-built) aircraft, we know of no regulatory requirement that even requires an ADS-B system check for non-certificated aircraft even if you did have the fullly-certified stack to be a 2020-compliant installation.
I have a Skyview system (Xponder & ADS-B Module) connected to a Garmin 430W. It works very, very well.