As he is transmitting at different times, could intermittent RFI affect those numbers? Paging signals and or nearby public/private repeaters are intermittent. If he did more sampling say at least three times each session vs. the single in the video, over two or three days...Yes, that is a lot of sampling, but more numbers help.
I have four 152 MHz paging towers that simulcast and cause terrible RFI. I use two PAR paging filters inline that help with my main RX antenna. Even my noise floor up on UHF will shift when they transmit without the filters inline. I also use a paging filter with my scanner in the vehicle and my VHF/UHF mobiles at home and in the vehicle. RFI and intermod were eliminated. I actually have six of those 152 filters in one form or another in use and that cost adds up quick, but it is worth it. I actually have six various filters inline on my main RX antenna to squish the RFI problems. The cost is just under $500 for the filters alone. That is because I am using a discone and cover a wide range of frequencies. For 225-400 MHz Mil Air I use a Mil Air antenna with a single specific filter for that range. As my coverage range is less for that, my filter needs are less.
Antennas and coaxial cable are essential, but without the filters for FM broadcast and or whatever else, one may suffer quite a bit and perceive their equipment is poor or faulty. Of course everyone's location is different.