If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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That's no-win given that ideas generally held on LW imply that we should sign up for cryonics.
There's nothing necessarily unfair about that. Suppose some group's professed beliefs imply that the sun goes around the earth; then you may say that members of the group are inconsistent if they aren't geocentrists, and crazy if they are. No win, indeed, but the problem is that their group's professed beliefs imply something crazy.
In this case, I don't think it's clear there is such a thing as LW's professed beliefs, it's not clear that if there are they imply that we should sign up for cryonics, and I don't think signing up for cryonics is particularly crazy. So I'm not exactly endorsing the no-win side of this. But it looks like you're making a complaint about the logical structure of the criticism that would invalidate some perfectly reasonable criticisms of (other?) groups and their members.
Nope. I'm making a guess that this particular argument looked like a good soldier and so was sent into battle; a mirror-image argument would also look like a good soldier and would also be sent into the same battle. Logical structure is an irrelevant detail X-/