Im not going to read your state's law but it's likely that it's written so that it covers the Marketplace facilitator (GB, eBay, etc) who likely has much more than 100k in total transactions in that state and thus all transactions which use the facilitator that terminate in the state in question are covered by the limit, or it could be that there is no minimum sales limit on facilitators in the 1st place, regardless of the company that's selling the items through the facilitator. Your business sales on your own website would be separately covered by the minimum limits though so if you only have a few sales in the state in question you would not need a tax id there nor would you be required to submit sales tax on behalf of your own business.
With regards to your Lowes doors, they will get a 1099-K from their CC processors for all CC transactions at the end of the year. Additionally yes any garage saler who uses Venmo or similar will now get a 1099-K at the end of the year if any of their transactions during the year exceed $600 with no minimal number of transactions, thanks to the Infrastructure bill. What you wont get is a 1099-K for any PayPal F&F or Zelle transactions as they are personal money transfers and not intended to be used for commercial payments.