It's either an out of date page, or they distinguish 21CN from GEA products.
For my Plusnet FTTC line, I sync at 79999, and have an IP profile of 77.35. Plusnet reflect this speed in their own copy.
Note that, while Plusnet's line speed reflects the same number, my experience is that the actual throughput lags behind the absolute best speed slightly. Tests where PN staff have given my line an "unlimited" speed, I've achieved throughput of a couple of Mbps faster. I guess it allows their QoS prioritisation system to work.