3rd ear. With great respect it is abundantly clear that you have little or no understanding of how ATC works. Separation for wake turbulence is applied rigorously by ATC at all stages of flight but it can still occasionally cause problems. I worked on 120.4 for 30+ years and I can assure you that such problems are not common.
We have been assured that there was 1700ft vertical separation between the aircraft, which was more than the minimum required.
I assure you that the controllers are highly trained and they know what they are doing. It is almost impossible to estimate altitudes or ranges from other aircraft from the ground so please accept that there was no danger to anyone.