Perhaps the author meant something like: "There is only one correct way [for a user] to do something [with your software]"? That would kind of make more sense

Perhaps the author meant something like: "There is only one correct way [for a user] to do something [with your software]"? That would kind of make more sense with the follow up remark that two ways is more complex. Otherwise I completely agree, every non-trivial design will involve tradeoffs.