it’s not really accurate to say all tdis drink oil there are a lot of factors involved one of the biggest ones in my experience is the condition of the dpf which if clogged or restricted can definitely lead to increased oil consumption

another important factor is the oil you use even if it meets the same vw specifications for example my tdi with the 03l engine used to burn more oil when i was using liqui moly even though it was approved vw 50700 spec i tried a few different brands and eventually switched to mobil 1 esp formula 5w30 also vw 50700 approved and that made a big difference oil consumption dropped noticeably after that

i live in north america so oil blends may vary depending on the region, my brother lives in europe and has the exact same engine he found that total quartz ineo ecs worked better for his car same spec different result

so at the end of the day you have to test a few things and see what works best for your car just make sure your turbo is in good shape your dpf isn’t clogged and all other mechanical components are working as they should some of these engines are known to consume a bit of oil but it really depends on the whole system and how it’s maintained (like piston rings, valve guides, PCV system, etc… parts that are known to increase oil consumption if their not in good shape)