We don’t know the ATOW.
We don’t know the derate(s).
We don’t know V1 & Vr.
We don’t know if they were using increased V2. (Bit short for that but...)
We don’t know whether this was “tight” for some reason or whether it was completely normal and expected.
In other words, complete speculation.
What we do know is that in normal airline ops, performance software optimises as much as it can and on this length of runway it normally ends up as a balanced field. Also remember that TODA can include clearway, which is beyond the end of the paved surface, so your 35’ will not necessarily be achieved at that point OEI (but it will by the end of the clearway).