No, it’s not. Necroing is spam, plain and simple, and most forums have rules against it. Proper forum etiquette is to start a new thread and link to any ancient threads that have info you think is relevant. In this case raider.io isn’t as widely used as it was when this thread started because Blizzard added their own M+ scoring system back in 2021.
It’s spam. It’s also against the forum rules listed here: