Dude, honestly, did you put ANY research at all whatsoever into these exploits?
1. The construct thing has been fixed, and has been for a while. When you hearth out, it spawns the constructs right where you left, thus leaving constructs around with possibly no one to kill them. Exploit to save you raid? More like "exploit" to an easy faster wipe than normal.
2. The Archimonde thing is old and also has been patched.
Either you're lying about your guild killing him for 4 months using these methods, or you used them back when they worked and stopped raiding, or you randomly found them on the internet and posted them here. Whichever it was neither of these work anymore.