In formal English grammar, the construction "whether... or if" is considered redundant and improper when introducing alternative conditions.
The Rule: The standard correlative conjunction pair is "whether... or" (or "whether... or whether"). Using if right after whether in a parallel clause creates a grammatical fault called faulty parallelism.
How to Fix It:
Incorrect: "It remains unclear whether the board intends to implement the proposal (1) / or if the statement was merely a strategic ploy (2)..."
Correct: "It remains unclear whether the board intends to implement the proposal (1) / or whether the statement was merely a strategic ploy (2)..." (or simply: "...or the statement was merely...")
So, part (2) contains the error because "or if" breaks the parallel structure started by "whether".