We should consider whether a technote is really the right place for this: with Jointcal being a first-class product, I'd like to see Jointcal documentation — including a description of the algorithm — integrated with the regular pipeline documentation following the vision of DMTN-030, rather than existing as a standalone document.

Is this Jointcal documentation still outstanding?

Yes, the documentation is still outstanding, but given the potential move to gbdes, I don't know that this has much priority.