Phyrexian Dreadnought and impossible choices

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Phyrexian Dreadnought

I interpret the the last ruling in Gatherer ("you may choose either option")  to say that you can still choose to sacrifice the Dreadnaught even if it is not on the battlefield.

I wonder how that fits with the rule that says you can't choose an impossible action.  Isn't sacrificing something that's not on the battlefield impossible?

608.2d If an effect of a spell or ability offers any choices other than choices already made as part of casting the spell, activating the ability, or otherwise putting the spell or ability on the stack, the player announces these while applying the effect. The player can’t choose an option that’s illegal or impossible, [etc...]

"Unless" has a specific meaning in magic:
117.12a Some spells, activated abilities, and triggered abilities read, "[Do something] unless you [do something else]." This means the same thing as "You may [do something else]. If you don't, [do something]."

As a result, phyrexian dreadnaught's ability really means "You may sacrifice any number of creatures with total power 12 or greater. If you don't, sacrifice phyrexian dreadnaught". Worded this way, it's clear that sacrificing the dreadnaught isn't really a choice, but a consequence. The only choice is whether to sacrifice 12 power worth of creatures (and that choice is subject to 608.2d).
Thanks for the explanation.
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