..it's own twilio.com, so isnt it transparently promoting twilio?

Or is your comment about sales versus engineers?

If their salespeople know how to fire up a little endpoint in kotlin using their API that's fantastic.

It's on the Twilio.com blog, so I think that it is pretty reasonable to assume that it's written by a Twilio employee. :-)

Marcos Placona is a Developer Evangelist.