Missable Collectibles?

[NoctisMorgan]

In Powerpyx, they said no trophy is missing as well as collectibles. 

But I have a big problem. 
In the sanctuary, I didn’t look at the Inner Garden Door in the beginning and went on my way. When I pick the garden keycard, I could open all the gates to the garden, as so the first one.
But when I opened it with the garden keycard, I couldn’t unlock the collectible.
Is there any other way to get that collectible without having to make a new game? 

[Eruyom]

you can replay levels getting or not the shorcuts, so no collectible should be missable, the door and key should be in the same spot in the collectible list, are you sure. you are not missing any other collectible?

[NoctisMorgan]

Yes. I'm sorry, after checking out, I was missing the collectible about the secret ending. 

Anyway, I just got the Plat, I'm done with it ?

[Taizuke]

Jinfeng's computer can only be accessed with the hacker key. But, even after acquiring the key the computer keeps telling me it needs a password. Pressing X doesn't do anything.

 

I've watched a couple of collectible videos for The Tower and none mention a password, only the key. 

 

To be fair I have the platinum. So, I already got all the collectibles once. But, in playing the game again in a second save file I've encountered this problem twice now. Last time I played The Club and then went straight into The Tower and having done nothing different it somehow worked. Most likely that's what I need to do again but I'm wondering if anyone has encountered this problem.