I think probably Planform rather than Sensirion...
I'm taking a wild guess for course; not a lot to go on from those images.
The only real references are the power plug. Not much in the coffee table image.
Edit, Other reference is the timber post, which could be guessed as a 4x4".
Two of the specs that can be lifted directly from the Sps30 data sheet are:-
Accurate: Measures particulates as small as 0.3 micrometers with an accuracy of +/-10 micrograms per cubic meter in concentrations.
When I received my first sensor, it's small size surprised me, 40x40x12mm.
Tiny compared to the other ones I've acquired.
The thing that jumped out at me though when I saw the first image without the cover was the similarity in the layout to one of the images in the application notes on their site.
This one.
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Edit.
If that's an Amazon Echo sitting beside it on the table etc in the linked page, that would be an 88mm wide reference.
https://www.weatherstations.co.uk/wp-content/uploads/Airlink-indoors.jpegBut again, I'm just making wild guesses.