This is not correct. The vehicle in question, for the last 4-5 BR reviews has been on the upper edge of its BR range. Its also had a considerable number of flyouts by more than just the users than those that claimed it it was them. Its had a constant upward trend since before the F-86s were moved down to 8.3 (which is why it was not moved down at the time). So its a little bit overexaggerated to say a singular squadron are solely responsible. Contributed yes, but as does anyone that plays a vehicle very well.
In the end anyway, the standard F-86s and MiG-15Bis family also have been on the upper end of their BR, so in line with feedback to bring them all into line, they will be moved up and the CL-13 Mk 4 increase held off for the time being so we can monitor it further until the next pass.