I don't really agree with that specific comparison, but the sentiment is true.
They've been rehashing the acoustic epic since 2000, with Dream Of Mirrors, Dance Of Death, The Legacy and Talisman. The latest one being the least original, IMO. Starblind is like if Infinite Dreams met Lord Of Light, and the Harris epics have had really predictable structures and chord progressions. Wild Wind being an exception.
This isn't really a huge problem tough, while some material is less original, it's still really good. Avalon is one of their more unique epics in recent years, which is part of the reason why I like it so much.