It is true. The link says you "employ" the DPC3208 which you also just told me you don't support. I'm a bit confused I can buy the 3208 from Mediacom but no firmware is offered?
Quote from link:
"We employ Cisco DPC3825, CPD3925, DPC3000, and DPC3208 units as well as Netgear CG3000D gateways."