Has apple fixed the system data problem?

You cannot control that category and the space used will fluctuate. One thing there you can control would be Time Machine snapshots; other than that, here is Apple's explanation of the category:

See used and available storage space on your Mac – Apple Support (UK)

Esauari Said:

"Has apple fixed the system data problem?: i have deleted my drive twice and eveytime i call in they give me some off the wall response. There is a serious problem on thier ha9 nds and they keep hiding it. how do you fix it? i have over 99 gb of system data."

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Riding of "System Data" (Formerly Called "Other"):

Back up your Mac, and then restore your Mac from the backup you've just created. For reference, refer to my User Tip:  Clear Other Storage on your iPhone or iPad - Apple Support

Report back if that does the trick.

babowa Said:

"We are talking about a Macbook Air here; there is no Apple documentation regarding that category for computers. It cannot be controlled by the user."

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As I Said: Report back if that does the trick. I'm not so certain it would work. So, try it and find out.

That's not a problem. That's how they designed it; as Microsoft is known to declare, "That's not a bug, that's a feature".

I agree it can be a problem for smallish disks, but it was done for a reason and only Apple knows why. If it turns out to be like those infamous keyboards, Apple will change it it. The best you can do right now is to give feedback to Apple.

Or you can do what I did and get the paid version of DaisyDisk to force the release of sequestered disk space.

What is the problem?

Writing an effective Apple Support Commun… - Apple Community

We are talking about a Macbook Air here; there is no Apple documentation regarding that category for computers. It cannot be controlled by the user.