It sounds like the tutorial is saying (a video link with a time stamp)
the first thing I want to show you is that one of the reasons why these verbs are so frequently confused
where confused is in the form of passive voice.
confuse has this meaning
Someone who confuses one thing with another thinks the first thing is the second
I rewrote the example in cambridge dictionary as
Jim is confusing Alice with her sister – she’s the one who moved to Colorado
question
which one in the following is idiomatic? (maybe both are)
- Jim is confused
- Alice and her sister are confused