Mark Gruman (Bloomberg) and John Paczkowski (Buzzfeed) both said no iPhones, both are very well known for relaying Apple's messages to the media. Don't compare these to the random unknown twitter users. Neither of them suggested iPads or Watches were to be announced yesterday, in fact Gruman explicitly said it won't happen.
iPhone X was different because they also announced iPhone 8/8+ at that event, which shipped a week later. You're suggesting Apple is going to announce FOUR new iPhones, none of which are shipping for several weeks. They've never, EVER, done that before.
FYI, holding events with product announcements in September and October is very very normal for Apple. They've done that several times in recent years:
- September and October in 2018
- September and October in 2016
- September and October in 2014
- September and October in 2013
- September and October in 2012
https://en.wikipedia.org/wiki/List_of_Apple_Inc._media_events