Instacard have released a public dataset[1] on their orders, so it should be even easier to verify this claim. From what I could find in some analysis[2] of this dataset around 100k orders per day and not per minute seems accurate.

I assume they are referring to how many database requests they have due to customers orders or a similar metric and just worded it poorly.

[1] https://www.kaggle.com/datasets/psparks/instacart-market-bas... [2] https://rstudio-pubs-static.s3.amazonaws.com/284199_5c498037...