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No, they actually support a wide variety of coins, including ETH -- meaning also all of the ERC-20 coins supported on its blockchain.

https://doc.satoshilabs.com/trezor-faq/overview.html#which-coins-are-currently-supported

Coin Marketplace

STEEM 0.16
TRX 0.13
JST 0.027
BTC 58986.04
ETH 2580.24
USDT 1.00
SBD 2.53