Were my Aldi Grillsteaks cooked?

[OneSparklyAquaSloth]

I just cooked 2 grillsteaks, each about an inch and a half thick. I put them on the grill section of the cooker, but used a baking tray rather than just put them straight on the grill (dumb, I know). Crazy amounts of oil came off them. I "grilled" them like this for about 18 minutes at 160c, flipping them 3 times. When I took them out, they were extremely tender and cut very easily. (this may be because I had frozen them previously). They were a tiny bit black on one of the edges.

They had no pink inside them and they were hot all of the way through, so I ate them both. But the extreme tenderness coupled with the dumb way I cooked them has me worried. The pack says it should be grilled at a medium grill for 18 minutes, and thats that I did, but of course they were on a flat baking tray the whole time.
Should I be worried?

No you shouldn't be worried. They were hot and not pink. I often oven instead of grill and as long as they are hot then they should be cooked

When you say "on the grill section of the cooker", do you mean you have a built in grill section on the hob? For me, grilling is under the grill, and I'd always put them on a baking sheet or a grill tray, never directly onto the grill shelf. If they're on a flat baking tray rather than the grill tray, the only difference will be that they're a bit more fatty as the fat coming out won't drain away.

If you grilled for 18m and they weren't pink and were warm throughout, then I'd say they were fully cooked. I imagine they were tender as they are already chopped up before being reformed, so they cut apart very easily.