From my understanding when you click on the lemmit.online link it brings you to a redirected archive, not the actual link.
Even still, I agree because it's annoying having posts with guaranteed no comments. Those posts only work if there is engagement surrounding it. No engagement and it's just spam.
Some of the main bots that are posting these are all on the same instance that are dedicated to Reddit posts, so you can block those whole instances in your settings
Since reddthat is on lemmy 0.19.1, you should be able to block instance. You can find this setting from lemmy web UI, not sure if it's already on lemmy mobile apps
This will probably not help OP, as he's asking for an Android client.
Desktop users: install Firefox, uBlock Origin, then add reddit.com to your personal user filters. This way you can still access Reddit if you really want to, but it'll make you think twice before proceeding.