Does it matter? Many Dutch 3rd party routes exists which are free and are at least of the same quality, often better quality, than what DTG comes up with.
AFAIK the only Payware Dutch trains are Chris Trains and he only does TSC. DTG would have to find other makers for building a fleet of Dutch trains There is a thread on the Dutch Forums https://dutchsims.nl/viewtopic.php?f=8&t=4164 The TSW route from Zwolle to Groningen only has two different units. Freight Layers are included but they require 3 or 4 additional Payware items
There was a Dutch payware TSC route in development. I even saw screenshots, but there has been no news for six months
So, announced in May 2025, and supposed to be released later that year. I think we can safely declare it dead then.