2019 Hymer Aktivs were built, shipped, and sold. Quite a few of them I'd guess. Just like there are lots of 2019 Roadtreks on the road... like mine.
Remember... model years start long before the actual calendar year. My RT was ordered in March and delivered end of July of 2018, but it is a 2019.
If you look at RV Trader you will see that there are 2 pages of new 2019 Aktivs on sale at various dealers. Most at La Mesa, who bought all of the loft version that were unshipped at the factory, they still have about 10 of them left.
2019 Roadtrek Simplicity SRT (almost a Zion)
2015 Roadtrek 170
2011 LTV Libero
2004 GWV Classic Supreme