Hi Nicole,
Exchange Online service and SharePoint Online service are two different and separate services, even though they are both parts of Office 365 Online service. Exchange Online is used for email, calendar and contacts, and SharePoint is composed of team sites, public sites.
In P plan, Exchange Online is accessed indeed through 128-bit Secure Sockets Layer (SSL) or TLS encryption, but SharePoint Online only has HTTP protocol in P plan. It should not be conflict with any statements.
Thanks,
Bourne Zhang