Agree with what others have said,
Highland Reel strongly prefers firm turf. Here are some quotes from his trainer from October 22:
"We were delighted with his run. He has been off a long time and
he is not a soft ground horse, but we were over the moon with his run," said O'Brien.
"That (America) is what we would be thinking about. It was the only place we could get a little bit better ground, by going over the far side."
https://www.thesun.co.uk/sport/horse...r-ascot-third/