Unable to create a smart folder based on Samsung camera model
There are EXIF tags for both Camera Manufacturer and camera Model.

The example on wikipedia shows:

| Tag          | Value       |
|:-------------|------------:|
| Manufacturer |       CASIO |
| Model        |     QV-4000 |


It appears that the Photos Get Info panel is concatenating these two tags. But only the Camera Model is available for Smart Album filtering.

If you change your smart album to search for your camera model, SM-G950F, it should find the photos.

There does not appear to be a way to filter via the camera manufacturer, samsung.

I can confirm your findings with my FUJIFILM X100T.