I think it's silly for them to announce what they're going to do in 2023. There will be a new Fed chair by then. The economic situation is impossible to predict in 2 years. The inflation / employment numbers are impossible to know precisely.
The projected rate increase is the result of the dot plots, which is the assessment of both governors and regional members of the FOMC. It is not binding and it serves merely as a projection.
If you watch the press conference, you can tell how annoyed Powell is at constantly having to answer questions stemming from what the dots show.
Unlike boomers immigrants spend money and take on new loans. Also, what are you going to do once you have hit 0 immigration? Are you going to deport people?