It was abused and is not covered by any warranty. I’m assuming the 22+ grand for chemicals and flushing is a typo. Typo or no typo; chemicals and flushing is pointless.
Warranty is for defects in material or workmanship; not for mechanical murder by you and/or prior owners,.
You have been asked about changing the oil and actually checking the oil level on a regular basis. You state turbo/engine trashed because of lack of oil. That comes across as oil sludging due to lack of oil changes and/or never checking the oil level.