We last spoke with Satoshi Labs earlier this year when they communicated that they didn’t have the resources to complete their final milestones (i.e. deprioritizing their work on Zcash shielded support). We discussed clawing back funding, but ultimately decided not to because (1) we don’t want to damage the relationship with the Trezor ecosystem and (2) they completed their work on the first three milestones and expressed their intention to complete the final two, though the timeline is unclear. We terminated the grant and advised them to submit a new proposal for the uncompleted milestones.
Regarding Taylor’s questions, I will email our contacts at Satoshi Labs for their answers and will update this thread once I receive a response.
Thanks!