Didn’t Wodan only have a notable speed increase because they changed it from polyurethane wheels to steel wheels not long after it opened, and the speed increases that came subsequently were down to the coaster wearing in over time?
As far as I’m aware, Wicker Man has always run with steel wheels, so the speed increase that’s happened since opening is down to the coaster wearing in over time. A lot of coasters tend to get faster within the first few years of operation, and it’s not only wooden coasters that do this; I know Helix at Liseberg was said to have wiped something like 4 seconds off its ride duration between 2014 and 2016, and I know many have said that Thorpe Park’s 2 B&Ms have grown to become faster and more intense over time, and that’s just a few examples.