It's possible to fuse the two accounts in thinking that the second game would have been called The Destiny Knight but with the Tales of the Unknown series heading.
Frankly, the developers have thrown so much shade at each other over the years that it's hard to separate fact from fiction with this series. He has also said that Heineman (who doesn't appear in the credits for the first game at all) sat in the corner, didn't talk to anyone, and wouldn't have been in a position to know what the plans were for the series. But principal author Michael Cranford has contradicted this account by saying that the first game was going to be called Tales of the Scarlet Bard until EA got involved and that there was never any plan to name the second game The Archmage's Tale. She has claimed in interviews that the second game would have been The Archmage's Tale and the third The Thief's Tale. Still, the series title does give some support to developer Rebecca Heineman's later claim that the original intent was to offer multiple games featuring different character classes under the Tales of the Unknown series heading.