Hi Lutz,
yes, this figure can be backed up.
Just, funny thing - definitely not via the German manual!!
https://www.strida.de/fileadmin/user_upload/Downloads/bedienerhandbuch_Faltrad_Strida_DE.pdf
There it says you have to refer to page 63 - and this page does not exist!! 
[size=150]Hej MSA - Euer deutsches Handbuch ist ein Sauhaufen!!![/size]
You have to look at the English manual, page 3 - 100 kg max. rider weight are correct.
https://drive.google.com/file/d/1OykZyoK2N1srOYRCjzhC2dhOzCEG56OB/view
However…on your place I’d not choose a LT model, you would waste much of your power in deforming the plastic wheels instead of propelling you forward.
Anyway you should try Strida before buying.
If you want to carry additional tons of load then you should definitely take a look at this brand:
https://bernds.de/faltrad/faltrad-daten/
140 kg limit for rider and load 
Kind regards,
Chris