Well the good news is (I think) it’s VW group, so I can tell you how I fixed my lazy ass wipers on my Passat and on my A4…
It’s a VERY common problem…
Basically, you need to get under the windscreen/bulkhead to where the wiper motor and mechanism is. What’s happened is the whole thing has started to seize up, there’s too much friction in there. If you catch it quick enough, you can save the motor from burning out. Managed to free mine off by spraying copious amounts of GT85 into the bushings whilst operating the wipers, which started to free it off, then a good quality spray grease in there afterwards to make sure it stayed nicely lubed.
Cheaper/easier/less hassle than letting it get any worse and having to replace the whole assembly and the wiper motor for sure!