Considering the Topps logo on the Gold cards is the only foil stamping on the card, it's simply that card you got missed the feed, or the machine ran out, or some other glitch occurred.
I'm curious on their process. Do the cards get serial numbered before cutting? If so, it would be interesting to try to find another 0561/2018 and see if it also missed the Topps foil logo (whole sheet) - but then you'd also have to find one that was one the sheet with the Torres. Fun stuff.
As far as it being a 1/1 - yep - any serial numbered card is. It's the only 2018 Topps Gold Torres that is 0516/2018 - a true 1/1. LOL
(This could be a nice ebay sell, but it cannot be listed here as an ERR or VAR.)
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).