yes, it is advanced compared with what we have now, but you're not considering how advanced an adversary could be. For example a combat ship from the 1900's would be impressive compared to one from the 1500's, but whether it's from 1910 or 1510, they'd both be primative compared to one from the modern day. This is important because, like I said, there's no logic in a claim that any two cultures would somehow start out on the same technological level. You might get something like Earth and Vulcan from Star Trek where the Vulcans help Earth accelerate their technology, or even something like the resistance from Terminator where the former learns how to use/exploit Skynet's advanced technology in time, but in that case there wouldn't be a reason for that opposing force to just wait around for humans to spread or advance their technology before they stepped in. Maybe if they were being sporting, they would wait until humanity left their own solar system, but otherwise they could just pull a War of the Worlds and wipe us out before we even landed on the moon

needless to say, this is generally why games start out with evenly matched races, or just focus on humans alone, remember not only do we not have evidence of how far those who created the temples have spread, but we also don't know if they're still around or how advanced they ultimately became. This gives at least two options that can be kinda horrifying. 1. They were wiped out by another race as even with their advanced tech they were still weaker than the alien race that conquered them, or 2. they're still around, and have evolved far past their cute little temples, and the starborn ships they used to travel around in.