I don't think that visual typing can be effective, but communication style can definitely provide cues as to which MBTI type someone is.
I used to think that I was INFJ. I compared my communication style to the communication style of some INFJ YouTubers and my communication style is quite different.
I noticed that a few INFJ YouTubers have a calm, zen, and indirect speaking style. That is not how I communicate. I am assertive, passionate, and systematic in communication. I am not super direct, but I have no problems with being direct. INFJs tend to pause a lot, which I don't do.