"Take -1 for each of your meatframe's current B-tags."
"Take +1 if you have one or more Meat tags that could help you."
Based on the difference in phrasing and how, do x if one or more, is generally understood, as written you only get +1 even if you have more than one relevant meat tag, in which case if you have -4 the total is -3, making a roll of even a 6 a three and thus a failure.