Poisoned Pawn Variations are not always all that poisoned!
Najdorf Sicilian: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2 Qxb2 is called the Poisoned Pawn Variation, and yet, nobody has found a refutation.
On the other hand, the French Poisoned Pawn really is poisoned!: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Qg4 Qc7 8.Qxg7 Rg8 9.Qxh7 cxd4 and here the pawn truly is poisoned as 10.cxd4?? loses to 10...Qc3+!
Now I don't play trash like the London System, and against it I do something completely different than you, so I can't speak for THAT "Poisoned Pawn" variation, but don't just assume that it means it's truly poisoned!
You'd have to find a Najdorf Specialist to go deeper into the theory. I only know it as far as White having the choice between 10.e5 and 10.f5. Najdorf isn't really my thing. The French is.
I'm in the early stages as a daily game (move 10) and the opening name amused me.
It started as an Indian game (1.d4 Nf6 2.Bf4 d5 3.e3 c5) and then after a few more moves (4.Nf3 Qb6 5.Nc3) I was considering taking the b pawn with my queen and attacking the c3 knight. Fortunately, the name given to this opening was "London System: Poisoned Pawn Variation" so I thought "thanks, I won't do that then..."