The look is likely a combination of subject, light, capture technique, and post-processing rather than one single “Dutch light” trick.

From the answers, the photographer is influenced by classic Dutch landscape painting and is known to use digital painting/editing software, filters, and Photoshop workflow. The sky detail and tonal control could come from graduated filters or HDR/multi-exposure blending, and some images also show noticeable vignetting.

The “Dutch light” idea refers less to magical light and more to local conditions: open landscapes with few mountains or obstructions can produce broad, dramatic skies and distinctive atmospheric light. A photographer may spend a long time scouting and waiting for the right weather and light to make that work.

So the effect is probably created by:

• careful location scouting and timing
• dramatic natural sky/light conditions
• use of filters, especially graduated filters
• possible exposure blending/HDR in some shots
• deliberate post-processing to create a painterly, moody finish

In short: yes, the images appear to be processed, but the style also depends heavily on the original light, landscape, and artistic intent.