Where is this no guest information coming from? This is not the Capital One Venture X that is losing guests completely. There is a guest change for Presidential Plus, but as the email I received states:
Effective August 1, 2025, your United Card comes with our United Club membership plan exclusive to Cardmembers. With the change, your United Club Card membership includes access for one guest and dependent children under 18 and no longer offers Star Alliance and other partner lounge access.
If you spend $50,000 you get
increased guest access: Guest access for up to 2 adults or 1 adult with dependent children under 18. (Plus other things, but only focusing on guest access in this post.)