That's if he had gone with the delay mechanism built into the law if there was a plan to sell it in the works. This is just ignoring the law.

No, this is something different. The law allows a 90-day reprieve only if significant effort has been expended towards selling TikTok. But ByteDance hasn't made any effort at all. Trump is instead trying to prevent the Justice Department from enforcing the law. But the penalties -- and they are very large -- for violating the law can be enforced any time up to 5 years after the violation; that is, after Trump has left office. So his action may not have any effect.