Are they bilingual or not?
Many U.S. Latinx speak a variety of English known as "Chicano English," "Latino English" or "Puerto Rican English". It is NOT "Spanglish". It is a variety of English with certain sounds that make it noticeably different from other ways that people in the U.S. speak English.
Listen to the following six (6) short speech samples. Do you think each person is bilingual in Spanish and English, or do you think they are monolingual in English (only know how to speak English)?