Aside of the shortcoming that Ardour's current normalization on export does not take inter-sample peaks into account,
well, no, it doesn't explicitly. But you do get to choose what the target level for normalization is, so simply by picking a value very slightly below 0dBFS, you ensure that inter-sample peaks are not an issue. Note also that when you normalize while editing, Ardour deliberately picks such a value for you by default.