Otto's results are published on Karnek, an account-monitoring service built by the same company. It connects to each of Otto's demo accounts through a read-only link and records every trade directly from the broker. Nobody can edit that record, including us. That is the whole of the reason it is there.
A screenshot can show anything. A backtest report can be run under any assumptions. A statement can be edited. A "verified" badge on a vendor's own site means whatever the vendor decided it should mean. A read-only connection that publishes every trade, every stop, the equity line and every deposit, from the day the accounts started, means one thing only: this is what happened.
The connection between Otto and Karnek is disclosed on both sites because it should be. A verification service owned by the vendor it verifies has an obvious conflict, and the only answer to it is design: the connection is read-only, the display is complete, and the record cannot be reset or trimmed. If you would rather not take that on trust, the page on evaluating a verification service explains what to check, and you can connect your own Otto account to Karnek, or to any other service, and produce your own record.
Five accounts run, one at each risk setting and one in Prop mode, from a stated start date. They include the losing periods, because they include everything. When Otto's marketing says a figure, that figure is read from those accounts, and the page it appears on says so.