The doc told the reader to add disableSslVerification() to
RustMatrixClientFactory.create(), which has not built the client for a long
time; getBaseClientBuilder() is where the chain lives, and it covers both the
login client and the restored session client.
It also only described the emulator's own proxy setting, while the app already
follows the device's global proxy through DefaultProxyProvider, which is the
only way to do this on a physical device.