Yes in that case we are talking about AI programs. The most well known at the moment is OpenAI Chat GPT. They produce very realistic sounding answers but those are often innacurate or straight up made up. Spotting them is not always easy but they often use the same writing style where they will restate the question in the first sentence. They use a lot of connecting adverbes like "however", "similarly", "therefore" or "overall". They will often use passive voice and very general sentences like "It is well established that...". The main thing is that after you see a few of them you can recognize the style.