Todrick surely have boot skills. I'm thinking he and Harry have fairly large feet, which makes it seem like the heels are not 5". I liked the fact that Harry didn't make a big deal of wearing the boots, and did pretty well with them without making the usual "fuss". And yeah, I'm sure they are just plugging "Kinky Boots", but that is OK. I'm thinking many guys might have watched a masculine guy like Harry wearing boots, secretly wishing they could give the boots a try.
And yeah, Todrick does come off as "gay", but it really isn't fair of us to make that assumption just because he is a great dancer. Needless to say, there are many straight guys who sing and dance. Todrick is obviously in good shape and has worked hard at being so good at dancing in boots.