That's definitely a Wix date code. Most likely a reboxed Wix. Bosch 3323 crosses to Wix 57356, which I know to still use round holes. The efficiency is too high for it to be an XP.
Last Bosch SteelTech I cut open was identical to a Wix.
I don't bother telling the people that come in and tell me Wix sucks I want the Bosch even though then they don't get the oil and filter sale price... Because they are usually snobby [censored] that deserve to waste money.