I can't find an algorithm for deleting features (points), so I can't delete features in the graphical modeler.
I found related information (Select by expression and remove points). However, I want to know how to use QGIS3.
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I believe it is not possible to delete features in the modeler, in this case use the extract by expression and put an expression that generates the opposite result of your current selection.
This will result in a layer with the features that match the expression you entered.
Therefore unwanted features were not deleted but ignored.