The answer is: No
The linked article suggests that this is possible in principle.
No, it does not:
- Please do read the big red box in the article. The text in the red box excellently explains why any “live enlarging” is a “bad idea™”.
- This article solely describes how to enlarge (though it consistently uses the term “resize”, which comprises both, enlarging and shrinking) a partition and a file-system on it, using unpartitioned space on mass storage.
- SailfishOS uses LVM volumes (i.e. not partitions) to hosts its file-systems.
- There is no generic, unused space on mass storage, hence one has to shrink something else, first.