Great anti-Android article. Any password manager that doesn't tightly integrate with the OS or browser has this issue when filling in passwords. Windows, MacOS, and iOS have the same flaw for apps that use the same method to fill passwords. Essentially the passwords are stored in the system wide clipboard until the user pastes it into a browser. A large part of the problem is a disparate browser architecture that doesn't allow for portability and password systems that are hard for people to use but easy for computers to break.
Either you can use a password manager and be careful about malware, or you can try to forgo the password manager and write down your passwords, or reuse them. Pick your poison.