https://www.uspto.gov/sites/default/files/OED_GRB.pdf section III describes the patent exam degree prerequisites. There are ways to satisfy the prerequisite with a non-ABET-accredited CS degree, but it involves more requirements (e.g. course work that may not necessarily be specified by the non-ABET-accredited CS major) and paperwork. It is likely that the intent is to screen out “CS” majors that are mostly business-based IT majors and similar less technical programs.