I actually agree. I think it's more likely PS5 will get announced at a PlayStation Meeting in February or March 2020, and still release November 2020.
releasing PS5 in late 2019 is dangerous for several reasons. Microsoft won't launch before late 2020 at the very earliest, and Sony would leave things wide open for Microsoft to launch a new Xbox with much better specs in 2020. But that isn't the main reason Sony shouldn't release PS5 in 2019, the biggest reason is giving their first party studios enough time to make PS5 games which could not be made on PS4 hardware, that stand out as "next gen" games. 2019 is an extremely tight time frame. late 2020 gives devs some breathing room, not only for launch, but post-launch games that could come no sooner than 2021.
PS4 is selling too well right now to justify releasing PS5 late next year, and combined with those other factors. Honestly, I hoping we can avoid PS5 releasing in 2019 and then having a PS5 Pro come out 3 years later in 2022. I think it would be better to have PS5 come out Fall 2020, and not have PS5 Pro until 2024, if at all. Sony shouldn't need to have, and wouldn't really be able to have another generation until at least 2027.