This caught my eye "An Arctic Adventure around Spectacular Scandinavia" - and "Northern lights Guarantee"
The trips are in the period Oct 2019 to March 2020 - your northern winter.
OK - I have lived all my life at 36 Deg south, and only occasionally in my 74 years have I seen the Aurora Australis - the Southern lights. Mostly as a much younger self out on the farm away from town lights. Now- Scandinavia and this tour is a lot further north than 36 Deg, but here's my question -
Can they guarantee that you will see the Northern lights?