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It seems to me if you have a serious need to prevent your reading list from being disclosed, you need to pay attention to the whole system, not just the reader app. For example, remember a few years ago Adobe was caught uploading the titles of all ebooks on a device through their ADE app, regardless of its origin? When caught, they said it was to verify licenses, but when questioned why they were "verifying licenses" for titles outside the ADE system they backtracked and claimed it was a "bug".
There is also the issue of current operating systems like Windows 10 & 11 "telemetry" uploading inventories of user content. Supposedly this can be disabled, but I believe it is enabled by default and the settings can be levels deep and confusing.
My suggestion would be to set up a restricted operating system on a single device and use that for your private reading material. Side load everything and never let it on the Internet. You can even go so far as to physically diable the WiFi and ethernet connections. Many Panasonic Toughbook laptops have a physical switch to disable WiFi so it can't be enabled accidentally. Older laptops and tablets are available at reasonable prices; not much horsepower is needed for a reader app.
You can use a reasonably secure operating system like TAILS (Linux) on a modest laptop. Or you could start with a fresh installation of Windows or whatever you prefer, do all the updates, and then disable Internet connectivity. Then side load everything.
Modern operating systems have made this issue very difficult to resolve. Serious security is hard, and is truly inconvenient. I'm certainly no expert, but I've come to the conclusion that an air-gapped system is the only thing that approximates what you are after.
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