I totally agree with you in your logic, we all make mistakes and this one is miner.
The problem?
Osteen is a prosperity preacher of the name it and claim it crowd. And like all of them he has two flaws. Prosperity teaches come from classical Arminianism theology. But the Problem that this post points out is their use of scripture out of context to make it say what they what it to say. The paraphrasing of scripture will lead to mistakes, it happens even with the best preachers, but the best of them would never make a mistake like this. Would you have ever see this kind of mistake come from Spurgeon or today's John MacArthur?
But your correct we all make mistakes but the Holy Ghost does not.