English isn’t my native language but i do not see them confirming your claim. What i see is them confirming that Terran **feel ** that they are behind.
“…Though TvP economy is a complicated issue, we believe the primary reasons for Terrans feeling behind in this matchup are changes made in the transition from HotS to LotV…”
Yes it is. If Terran is on 3 bases when p is on 5 bases then there are other factors not related to the economy and thus your argument is flawed.
On avrage Terran should be 1 base behind p.