No... That's silly. Did you even read Bungie's update way back when?
1) BASE difficulty increased (aka harder solo in the first place)
2) For every player in the team it gets slightly harder (MORE hp)
3) If you consider the difficulty increase, it is easier if you actually have 3 people shooting, if not it has simply gotten harder.
English
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They said they didn't want people to feel having a full team made it more difficult andv that they understood how it made it more difficult for solo players. That's how it sounds to me
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It still increased per player, but if all 3 of you are actually shooting it doesn't feel like it's increasing. A player's gun > difficulty increase But an AFK player makes it harder for the others.