I did, especially the part where they said (my emphasis):

“The capital costs are really high, and maintenance is an issue,” said Jaydip Parmar an engineer in Gujarat who oversees several small solar canal projects.

Granted, these are technical problems that can and should be overcome. However the title of the post and article says “why aren’t they widespread?”, so it seems fitting to discuss these reasons.

The other answer is also in the article:

Still, rapid change isn’t exactly embraced in the world of water infrastructure, said Representative Jared Huffman, D-Calif.