> 3. (geology) Of, relating to, or caused by large-scale movements of the Earth's (or a similar planet's) lithosphere

- https://en.wiktionary.org/wiki/tectonic

I expect the parent is referring to human-caused melting of glaciers as the root cause of that tectonic movement, rather than the expected natural motion of the tectonic plates.

It's the glaciers melting at the end of the last Ice Age that Scandinavia is still rising from.

https://en.wikipedia.org/wiki/Last_Glacial_Period#Weichselia...

> As a result of melting ice, the land has continued to rise yearly in Scandinavia, mostly in northern Sweden and Finland, where the land is rising at a rate of as much as 8–9 mm per year, or 1 m in 100 years. This is important for archaeologists, since a site that was coastal in the Nordic Stone Age now is inland and can be dated by its relative distance from the present shore.