Hmmm, sounds fishy to me

• you in since 2018 but you don't know Sparrow has never had an app and you can download the file from their site and verify with PGP?
• You yolo your stack one seed phrase?
• I see his X account posts pics of multiple signing devices surely he could have gone multi-sig or at least split his funds across several single sigs
• Has man posted the pubkeys so we can verify and follow UTXOs?

Anyhoo questions that will remain unanswered

Never the less a major gut punch, wouldn't wish this on anyone!