It's bandied about as common knowledge that dwemer were of average height for humanoids, and their common name "dwarf" is a misnomer, a name given to them by giants (to whom we would all be "dwarves") We get this from in-game sources, books which are known to be unreliable. Further, other in-game sources
do describe the Dwemer as shorter than average. The only Dwemer we've ever seen in game have been ghosts or infected with corpus.
I know this is one of those things that we like to state with authority, but how reliable are our facts?