Yes, clearly a pro-Roman source.
The facts, as they say, are well known and otherwise. Pope John repudiated because of factionalism at Rome and Constantinople, not because anyone deceived him.
Your sources are? Pope John accented only to the report of the legates. Once the actual acts were forwarded by Photius for ratification he condemned them.
P, scroll down about 1/3 the way on this link for a discussion of this entire affair within the context of facts on the ground in Rome, Constantinople and Bulgaria.
http://www.orthodox-unis.net/en_history.htm
The article is by Metropolitan Kallistos (Ware) of Diokleia who, as you likely know, is an Oxford don.