It's doubtful if the Binding Seal Beast truly craved those Immortal Apricots. It was possibly a pattern it deliberately cultivated about itself, a weakness displayed on purpose.
This perceived weakness was intentionally left as a flaw. Should anyone exploit it to trick the beast, it would signal the opportunity for it to break free from the Treasure Seal.
Master Sun felt he played an "unexpected role" in the Binding Seal Beast's plan, but the creature seemed prepared for such "unexpected" factors, feigning naivety and charging towards the Immortal Apricot Tree.
By now, everything had proceeded according to the Binding Seal Beast's plan, and the real key determining the outcome was the battle to possess the Immortal Apricot Tree.
