TpContact has this:

  if (wanted & CONTACT_FEATURE_FLAG_PRESENCE)
    {
      boxed = tp_asv_get_boxed (asv,
          TP_TOKEN_CONNECTION_INTERFACE_SIMPLE_PRESENCE_PRESENCE,
          TP_STRUCT_TYPE_SIMPLE_PRESENCE);

      if (boxed == NULL)
        WARNING ("%s supposedly implements Contacts and SimplePresence, "
            "but omitted the mandatory "
            TP_TOKEN_CONNECTION_INTERFACE_SIMPLE_PRESENCE_PRESENCE
            " attribute",
            tp_proxy_get_object_path (connection));
      else
        contact_maybe_set_simple_presence (contact, boxed);
    }

So if the contact asks for the presence feature, TpContact is allowed to complain that the connection claims to support Contacts & SimplePresence but actually doesn't, even if the connection makes no such claim.

This is happening with rakia, and Empathy/Folks is trying to create TpContacts with a blanket set of features for all CMs, which I think is a reasonable thing to do.