Nope, not quite. Longbow bodkin arrows go through when hitting directly, crossbow bolt from a heavy crossbow goes through the whole armored knight, including the shield. Direct thrust from a polearm can pierce it too.
Plate armor was not built to withstand blows like tank armor, it was made to made blows glance off the user.
Longbow bodkin arrows could not usually pierce well made plate. Even if they somehow did, they would still be unlikely to pierce the padding and do organ damage. Arrows killed armoured knights by hitting them in the gaps in their armour, not by piercing the plate. Even mail could stop longbow arrows at medium range.
A crossbow bolt could pierce plate at short range, but punching through a man seems unlikely except in the case of very big and slow crossbows.
Stabbing with a polearm would not pierce plate. Smashing would send a crushing shock through the armour and damage the victim underneath.
Piercing plate was very hard to do (if you have ever thrust through plate, please tell me about it), and most attacks on plated opponents involved smashing with blunt weapons or attacking the gaps in the armour. See the historical treatises for proof of this, and also this video and others on the channel:
https://www.youtube.com/watch?v=q1WZLVZYBwQ