On TopCashBack, am I considered a New Customer or an Existing Customer if I want to purchase a product from the same vendor?

Long story short, I officially became a new customer when i downloaded TopCashBack yesterday for the 20% April Fools Day sale, downloaded Slide, and bought a Lowe's gift card through Slide for $200.

I was leery of spending more, even though I loved the high return, in case this ended up not legit. But lo and behold, it seems that it is indeed a legit cash back site, as 20% is now 'pending' to be credited to me!

I want to buy another Lowe's gift card from Slide now (since they extended the 20% off sale for 5 more hours). But if youtake a look at this, it says it's 20% for New Customers versus 5% for Existing Customers. Does that mean just one purchase counts to be a New Customer?