No one has or is alleging that the Queen is or was a Nazi sympathiser. Given her age in the video, the chances are even less likely to support it. It does, however, bring the moral judgement of her elders into question. The argument for its inclusion is that it is obviously a major media event that has caused controversy and underlines the Monarchy's interests in managing its public image and suppressing anything that might compromise it. It is perfectly within reason to present this matter-of-factly and without bias.