Sure, that’s technically true, but I think it’s acceptable for this infographic’s purpose.

• I don’t believe a US company profits from someone using LibreWolf (unless you want to count volunteer labor if someone upstreams their contributions, which doesn’t apply to most of the target audience)
• As you said, any other usable browser is going to be based on Chrome, FF or Apple tools. So what should it say? Nothing? Even if it’s not perfect, I believe LibreWolf is a far better suggestion than just leaving them with a default choice like Chrome or Edge, or something unusable on sites they want to use.