A couple of considerations:

- I presume that your realive needs to purchase the BTC, since he is holding 30K$ to send over to you. Purchasing BTC on an ATM machine is normally pretty steep in terms of purchasing fees (look at https://coinatmradar.com/bitcoin-atm-near-me and filter by California). The fees seem to be between 6,7% and nearly 20%, a massive amount that he would probably need to pay out of the 30K being converted.

- Being the above the case, I figure he wants to use a BTC ATM for anonymity reasons. If so, someone is going to have to show some ID there due to the amount being sent (unless it’s been done in smaller batches). That may go against the objective on the sender's side.

The 700$ is certainly not going to go towards confirming the TX, and is way lower that the purchase fee that will be applied as per those announced on ATMs in California, so it doesn’t really add up (less of all sending it to an address "tied" to the ATM).