Lightning Thunders in a Down Market

>...spending of bitcoin (the gold line) on the Lightning Network continues to rise, thus evidence that people are not just sitting on (hodling) their bitcoin, but using it to buy goods and services, even during a seriously down market.

I believe spending, when measured in BTC, would have to rise as the value of BTC decreases as it takes more BTC to spend X amount of money. It would be more telling to show spending measured in USD.