The point is about invaders and tyrants.... about rape, brutality and plunder.....not about Hindu-Muslim relations.
Many Muslim kings such as Akbar, Jahangir and Shah Jahan, in the 1500's, had formally married Hindu princesses. These kings were well loved and respected by the people.
I wonder if Prince Harry could marry a Muslim even under today's 'liberal' circumstances!!
At any rate, the present controversy is about a film showing a respected legendary queen in bad light. Not about Hindu Muslim conflicts.
I think the controversy at this end is reading about the threats of beheading, cutting off of noses, burning alive of the lead actress from a member and activist of a leading political party. That doesn't happen in the UK as far as I know.
The Hindu-Muslim thing may well be a lesser issue than the Queen in sex scenes with the invader in a dream sequence. But given the actual threats are from an extremist member of the right-wing Hindu nationalist party, I would think the invader being Muslim and the film being supposedly based on a Sufi poet's text might be part of the issue for the extremists. Muslim extremists issue similar violent threats to people - what with tolerance not being seen as a virtue by extremists.
The director seems to be denying that such a dream sequence scene exists.
He says in an online video,"I've made this film 'Padmavati' with a lot of sincerity, responsibility and hard work. I have always been inspired by Rani Padmavati's story and this film salutes her valour and sacrifice. But because of some rumours, this film has become a subject of controversy....Through this video, I am reiterating that in our film, Rani Padmavati and Alauddin Khilji have no such scene together which will hurt anyone's sentiments.”