It says…
… string of the form [[longitude1,latitude1],[longitude2,latitude2]… Note the reversal of …
I think
[[latitude1,longitude1],[latitude2,longitude2]
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Yes, indeed the MIT documentation is incorrect, The format should be
[[latitude1,longitude1],[latitude2,longitude2]] as is shown in the Designer.
which indeed shows the latitude followed by the longitude coordinate.
The documentation erroneously states:
PointsFromString Set the points of the LineString from a specially-coded character string of the form: [[longitude1, latitude1], [longitude2, latitude2], …] Note the reversal of latitude and longitude versus how they are typically represented. NOT TRUE.
Regards,
Steve
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Hello!
Thank you both for reporting and confirming this bug 
I’ve created a tracking issue (#2176) in case you guys want to keep up on what happens to it. I’m pretty confident we can get this fixed!
Thank you again,
–Beka
@BeksOmega Is it a bug or a documentation problem? The LineString works fine provided the geocoordinates follow usual GIS convenction of latitude first and longitude second.
Thanks.
Ah sorry my language wasn’t very clear. Definitely a documentation problem! The reason the issue is tagged with bug is because there isn’t a documentation template. The reason I said bug in my previous post is because I’m a derp hehe.
Thank you for asking for clarification!
Oh no, showing my generation. When I was in graduate school they called us drones or research assistants.or interns 
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This has now been fixed via #2187. I believe the fix should go out with the next release of app inventor. Thank you guys again for reporting!