The actual study they used states:
a) it is suggestive...
b) "there are no studies evaluating the carcinogenic potential of meat in relation to its content of carcinogens."
c) "we performed this study focusing on Spanish population."
d) "the study population should halve the monthly consumption of these foods, and also not to surpass the number of 5 servings of beef/pork/chicken (considered together)."
e) mentions chorizo
Title: An estimation of the carcinogenic risk associated with the intake of multiple relevant carcinogens found in meat and charcuterie products