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So the bigger point here is that RSUs are worthless... until they vest (at which point they aren't RSUs anymore). So, technically, Juno is being incredibly generous by offering any value whatsoever for RSUs ("unvested stock").

Now, even more technically, RSUs do have value and are kept on company books at the same value as the underlying stock. But they don't have value to the RSU holder.

And unless you have an acceleration clause in your equity agreement (which most people can't negotiate until they're pretty senior), those RSUs expire with a $0 value. (The value of the underlying stock drops to $0 because the corporation no longer exists.)