Seems that at this moment, the mempool is not as full anymore... You could even get by with 7 or 8 sat/vbyte i guess.
The main thing to remember: opening and closing channels happens trough an on-chain transaction. If there's a fee-bidding-war going on because the mempool is overflowing, you'll pay a lot to open and close a channel. If the mempool is (allmost) empty, you might get by with a 1/2 sat/vbyte tx. This has nothing to do with the lightning network tough, it's because of the current size of the mempool (and the fees of the transactions in said mempool).