This is the first time we hear something about a smaller Galaxy Note but it won't be the first time Samsung has done something like this. What might prompt Samsung to do it once more is believed to be the success of the Galaxy S10e.
The most affordable of the early 2019 Samsung Galaxy flagships is very well-received by the media and the consumers so Samsung will try to build on that. Also, if the upcoming Galaxy Note10 really is built around a 6.7-inch display, there will be plenty of users looking for a smaller size, which the older 6.4-inch diagonal of the Galaxy Note9 will enable given the shrinking bezels.
According to an inside source, Samsung has already sourced the parts from its suppliers, but it's all just rumors for now. It's believed that if the company goes along with the idea, the Galaxy Note10e - if that's the name - will launch in select markets with Europe being one of them.