Just an update on my case.
And here is my YT video to show faint creaky noise issue at creeping speed. Hope it will help someone else with same problem.
I sent my car to a nearby dealer on Monday and got my car back today. Been at dealer for 3 days. They found defective left front air struct and replaced it with a new one. The part came in just 2 days. Seems supply chain is less of a problem now? The noise seems gone at test drives on my way back. But I will keep eyes on it and see it really solved the issue coz I wasn't sure where exactly the noise came from, front, rear, left or right.
Very disappointed the air struct gave way at 21K miles. Now I am concerned how long the other three will last.