I was asking ignitionet
I think blueacid already answered you.
The post I responded to was suggesting that Hyperoptic limit tiers by controlling speed and duplex on the switch ports. Aside from being a bad idea that wouldn't permit a 20Mb service, so the rate limiting can't rely on port speed.
I also note 100Mb speed tests are faster than is possible with Fast Ethernet, so the NIC must be connecting at 1Gb.