In the first sentence "you" actually refers to you, a person, in the second you're intentionally cheating and applying it to a machine doing a mechanical transformation. One so mechanical that different LLMs trained on the same material would have output that closely resembles each other.

The only indispensable part is the resource you're pirating. A resource that was given to you under the most generous of terms, which you ignored and decided to be guided by a purpose that you've assigned to those terms that embodies an intention that has been specifically denied. You do this because it allows you to do what you want to do. It's motivated "reasoning."

Without this "FOSS is for learning" thing you think overrules the license, you are no more justified in training off of it without complying with the terms than training on pirated Microsoft code without complying with their terms. People who work at Microsoft learn on Microsoft code, too, but you don't feel entitled to that.