Somewhat true, he was really wishwashy.
Download his entire testimony and then keyword search for Christmas, Birthday, etc.
Link to every transcript:
Jackson's is the last day's testimony.
Below is a notable exchange:
Q: So, for example, if they had become inactive or sought to fade without formally disassociating, and the elders came to visit and found them celebrating Christmas or a birthday, they would be found to be in transgression of the rules, would they not?
Jackson: That is not my understanding. But again, as I said, it is not my field, that goes into policy with regard to those type of things, but from my personal experience, that's not the case.
Jackson: Yes, but if I could mention, Mr Stewart, your first proposition you put forward, that they meet someone who is celebrating Christmas ‐ you know, this person is not associating with other Jehovah's Witnesses, not actively trying to change other people, and so on ‐ a person such as that is not going to be handled judicially, as far as I understand. So, sorry, I have to disagree with you, but I hope you can see