Eero6e Pro Speed Test

I’m having problems with my internet. I have a 2.3G symmetric connection but the upload speed has dropped to the order of 50-100Mbps.

I’ve tried a couple of routers, different cables and connected my Mac directly to the ONT. They all show reduced upload speeds, except for the Eero App speedtest which shows 2.3 Symmetric.

What exactly is the Eero speed test testing, packets against a server somewhere or some test of the fibre line speed?