Hi MDLRCASE
We are glad you like ATUM. Thanks for those nice comments ๐
Regarding your question: ATUM uses its own custom tables when possible and doesn't mess WooCommerce data. Also, if you enable the option to delete all ATUM data after uninstalling, all the data created by ATUM will clean up from your database when doing so.
The only thing that perhaps you'll have to adjust manually for all your products after uninstalling Product Levels (if you have been using such add-on for a long time and had the BOM stock control option enabled) it's the stock quantity values because the value you had on the products before assigning BOMs to them will remain untouched and will use the calculated stock (that it's an ATUM's custom value).
I hope this helps.
Best Regards,
Salva.