The card is correct. Depending on where you are, if you call DIsh, they will ship you either a 311 or a 211. If you only have a single 301 on the account, it will likely not require any type of service call (unless they need to do an arc migration and change the sats you are aimed at). Shipping the receiver is free, and has no commitment, and if a tech visit is required due to a required change of your antenna, there is no cost or commitment. Now, if it's only a receiver and you force a tech to come out, you may be charged for a tech, but really, if it's only the receiver, they will ship you one, and you can connect it yourself.
One more thing you mention. You own your 301. If you replace it, you will either choose a leased 311/211, or purchased. The default is to send you a leased receiver. If you have to own it (why, I do not know...there is zero benefit in owning versus leasing, the monthly cost is identical), you would have to buy the receiver. Leased, no cost at all to you.