Whatever it means, it was only to be done while you were around Jewish believers!
The Bible clearly says if you're in the home of an unbeliever, you can eat whatever you wanted without making any inquiry in regards to your conscience.
1 Cor 10: 25 " Everything that is sold in a meat market keep eating, making no inquiry on account of YOUR conscience; 26 for “to Jehovah belong the earth and that which fills it.” 27 If anyone of the unbelievers invites YOU and YOU wish to go, proceed to eat everything that is set before YOU , making no inquiry on account of YOUR conscience."
The key here is "unbelievers". That is, if you're around unbelievers you can eat anything. This acknowledges the rule about abstaining from blood in another circumstance, which would be around Jewish believers. So that rule was made for congregations where the weak conscience of Jewish converts was consistent and offensive to eat blood. That was appropriate to keep peace and consistency within the congregations. But that was for the sake of the weak conscience of the Jewish brothers. But there are no Christian rules against blood or anything else that is taken into the body if it does not violate your conscience (i.e. tobacco?)
But, if you are outside that community and with an unbeliever, perhaps an unbelieving relative, you don't have to apply the "abstain from blood" rule and you can chow down on all the blood sausages and tobacco you want to. It's not sin. Nothing taken into your body is a sin. What you eat does not reflect your heart condition. What comes out of your mouth reflects your heart condition and can defile you.
Think of all the blood transfusion deaths that were unnecessary, perhaps, because of this stubborn misinterpretation by the WTS? That's why they are called the "man of lawlessness" at 2 Thess 2.
One place says "abstain" another says, "eat everything." But this is not a conflict. The context of eating anything is in the home of an unbeliever. The rule to abstain was to be followed when you were around believers, but that comes from the context of this being lots of Jewish believers.