Not at all, do you know what ISSNHL is? Both of these studies concern SSNHL and not noise-induced loss. ISSNHL by definition precludes noise trauma, and also implies some process other than gradual age induced loss.
I believe I've posted both of these on here myself at some point. I have consistently said that more study is needed in this area but that the best studies showing efficiency relate to SSNHL and not noise trauma, and then secondly that the best data for noise trauma comes from some US and Israeli military studies where steroids were in some cases administered prior to trauma or within minutes following.
The applicability of SSHNL-related tinnitus onset to noise trauma, is, likewise, something that needs more study, but at face value neither of these studies seem that useful to your typical noise trauma patient. When I have my server box put back together I can send you the studies I do have on noise trauma and either transtympanic or oral sterioids; I believe I've got a dozen or so.
I don't think this is a question of "is there any effect"; there's enough (in some cases conflicting) studies to think there is an effect of some kind. Efficiency and safety vs serious adverse side effects is another story.