Yes, the allegation was always that ANL had paid GB to change his evidence, especially as he contacted them in 2023 and made a statement for them. Hence his statement for the current court proceedings (his 'second' statement) was made with independent lawyers.
Berlin's evidence could be interesting (at least more interesting than Sherborne dragging in unrelated articles, hopefully).
GB was also said to fear for his life, hence why his location was not to be disclosed. I may be wrong, but the impression I got was not that he was afraid of ANL.
When we discussed hearsay evidence on a previous thread, one of the points mentioned was that the judge could decide for himself how much weight to give it - and in GB's case that might not be very much, given his second statement withdrawing the first.
Now that GB is giving evidence in person, he will presumably have to face questioning on both statements, as both are court documents. We know from the judge's earlier ruling that ANL is no longer limited in its cross-examination, but that Sherborne will have very strict limits.