That's a possibility, but it's also possible that he has a stubborn mead. I've noticed that sometimes when I let a mead or other brew go fully clear, and I do a bad rack, making it cloudy again, it can remain cloudy for a long time. If you already used a fining agent, I recommend to use different now. If you live in states, sparkolloid could be your best choice. If you don't want to use a fining agent, a wine gravity filter might be a good invest or even something which has a pump, like buon vino, if cost is not an issue.