No he hasn't. He quoted a quote from a quote from a different forum.
The testing of the BK 3.7 started with ZG1 in late 1942. More than a year later ZG 76 were still using the gun: "By spring 1944 I./ ZG 76 were based around Prague, and operating a number of Bf 110G-2/R1 types with an underslung BK 3,7 37 mm cannon in a conformal-mount ventral gun pod."
https://en.wikipedia.org/wiki/Zerst%C3%B6rergeschwader_76From John Weal's book "Messerschmitt Bf 110 Zerstorer Aces of World War 2":

I posted a better version of this image earlier in this thread and it is pretty clear all the 110s are armed with the BK 3.7. Due to overexposure we can only see the barrel on the closest one but the bulge under the fuselage is clearly visible on all of them.
In late 1943 the BK 3.7 was clearly still also in use by ZG 1.

Bf 110 G-2 of 1./ZG 1 seen in Bad Lippspringe during August/September 1943 equipped with a BK 3,7 cm belly cannon. Left is Flugzeugführer Lt. Manfred Thewes, later Staffelkapitän 1./ZG 26 and then 1./JG 6 in the Reichsverteidigung. Next to him five victory ace Staffelkapitän Oblt. Rüdiger Ossmann KIA on 08 October 1943 in combat with US Viermots 20 km east of of the Dümmersee at the controls of Bf 110 G-2 "S9+AH" WNr.120047.