What I get from the section is, if an account is forked out, they can go ahead and try to run a version of the blockchain where they're not.
That is one of the key points of the section.
But the other point is even more significant: even if they didn't have the recourse to run a copy of the software where their stake is still there, they still would have no legal recourse, because the node operator ran the software on a completely voluntary basis and has no contractual obligations to run any particular form of the software (or even to continue running any form of the software). This isn't destruction of property in the traditional sense, because the "property" in this case was just a free benefit/service offered by the software operator (plus the other people who run computer nodes of the software).