I think that Spadaro isn't slandering all Evangelicals.  He is criticizing a subset of far right Evangelicals and far right Catholics who ascribe to an odd mixture of Dominionism and Prosperity Gospel and who hang around Trump.  There is a huge gap between the moderate Evangelicalism espoused by Gerson and Moore and the hard right type espoused by Bob Jones University, the Quiverful Movement, etc.  Spadaro (and Pope Francis) are clearly hitting the fundamentalist strains that are most closely connected with Trump and the bad effects that they have had on American Catholicism, especially the Catholic laity.  If you go to rightwing sites, you will notice that conservative Catholics have begun to embrace some of the heresies of fundamentalist Protestants such as the "prosperity Gospel."