No it doesn't.
But I am thoroughly convinced you are confused as to what specific you are speaking about.
Your claim, the one we were discussing, was in reference to Trump firing Comey and obstruction
(from your link), in which you even claimed trump broke the law.
What you now reference has absolutely no relevance to that discussion.
Trump has the authority to fire Comey. Period.
And what we know of Trump's statements he wanted the investigation to continue. So Comey's firing was not to obstruct..
Secondly the information from the OP (Comey's own memos) confirms Trump's public comments that he wanted the investigation to continue.
So again no obstruction. We also have to keep in mind that we now know, Trump is not a target.
So your link, in relation to what we know is just bs.
On to what you cited.
I do not know how you think the Court later moving closer Scalia's position supports you, but that is really irrelevant as none of it supports your argument.
What you cite references the firing of an Independent Counsel in regards to the
Independent Counsel Act that was in effect at the time.
That Act, which was law at the time, was found to be Constitutional and applied to the President because it
"did not violate the principle of separation of powers because it did not increase the power of one branch at the expense of another".
That is Independent Counsel Act (Law) dependent and does not apply to the FBI Director.
Now if you are somehow arguing the possibility of firing Mueller
(which would be odd given your quote and claim the Trump broke the law), you would also be mistaken, in that the law which that decision was based on is no longer in effect. So the opinion is moot.
Currently it is an internally created DOJ Reg (not law) that states only the AG can fire the Special Counsel.
In order to claim Trump does not have the authority to directly fire Mueller (if this is what you are now arguing), you are going to have to show how an internally created regulation (not Law), from a subordinate authority, applies to the President.