I think we need to wait for confirmation from Tesla on the Model 3 refund issue. Just looking at a refunded credit card transaction does not tell you anything about final deposition of the reservation. For example, a customer actually buying the Model 3 may have a refund on the reservation and make an order deposit or final payment through additional transactions. Notice that the refund rate has increased with production, which would be consistent with refunding reservation deposits in coordination with selling the Model 3 cars.
Only Tesla and the customer should have full visibility into this. Not even a single bank would have complete information on the actual sales transaction. So I'd be wary of a third party looking at anonymized data.
Shorts especially should be wary of fools gold here because if the refunds are in fact linked to sales, then these stats will continue to go up even as production and deliveries increase. So shorts are likely to feel encouraged about their position at just the time as Model 3 sales are boosting the income statement.