The bill's comments aren't legally binding; only the text of the bill would be binding. The comments would be used for voting rules on the bill itself and potentially to determine the law's intent in a court challenge. IOW anyone can say anything they want, but when it passes, it's the text of the bill that counts, not the speeches that surrounded it.
I agree with you that it's not specifically for Bush. It's for the one that comes after Bush, which is most likely Schwartzenegger. It's my opinion they'll have any legal obstacles preventing his presidency out of his way by then. They'll run him against Hillary to scare everyone, then we'll have a nice foreign usurper in control, and an Austrian at that. Just like Socialist Germany did.