It makes sense to have a final press conference about the final games for the Switch. They want customers and partners to know about major games still planned for the system,. especially if it is still going to be “current gen” during the holidays. It could be a going away party for one of the most successful video game systems.
It is possible (and even likely) that the Switch 2 will not be announced yet. I suspect that if they planned to announce the system this month, they would have said as much. This feels more like “we plan to announce in 6 months but don’t want to say as much in case plans slip”.