Thing is...sometimes it can hurt to try. Not always, but there's plenty of members who can tell you about crashed bio-filters traced back to "instant cycling" products which contain the wrong type of bacteria.
The articles will explain it...but briefly, the wrong type of bacteria can perform nitrification and make a tank appear cycled, but the substitute bacteria is very short lived and needs to be re-added constantly. Problem is that it can outcompete the real bacteria you want in there so it may never fully develop like you want. Then, if the other bacteria were to die off...you're left with a tank which doesn't have an efficient bio-filter because the true beneficial bacteria never had a chance to colonize because it was outcompeted with the substitute stuff. There's plenty of people who can tell you about their tank appearing cycled, just to test one day and have massive toxin spikes come out of nowhere for that very reason.