Regarding Observation 2767717 …
I thought this pass was quite unusual as you can clearly hear the Hong Kong VR2KP terrestrial repeater at the beginning. From some research the output of VR2KP should be on 435.275 MHz which is nowhere near the uplink frequency from NUSAT1 that seems to be between 435.935 and 435.965 MHz.
VR2KP does have a VHF repeater as well with an output on 145.650 MHz. Again that 300 KHz away from the satellite downlink (not to mention that even if it was sporadic E, it would be a 1612 miles / 2595 km report from Hong Kong to Singapore…)
Happy to hear about your input !