It's like when universities send out acceptance letters to applicants that didn't make the cut...Oops. The reservation date made it highly likely this was a mistake. Sorry they got your hopes up.
Given the timing of the GT confirmations and when Lucid thought they were going to start production (2 - 3 months in advance of start of production), I'm hoping late March or April is when we might start to see T confirmation emails. The pessimists on this forum would guess May or June. All depends on how many GTs Lucid decides to produce before they start T production and ramp up in production quantity.