An advisor is different from a broker.
Moreover, also in that document.
A prospectus must be prepared and published before securities or collective investments are offered or admitted to a Swiss stock exchange.
And the Prospectus requirements are significantly simpler than the EU requirements.
Oh, and you can opt-out if you have > 500k in assets and sufficient trading experience. (Or assets of 2 million without trading experience.)
And if you look elsewhere in the document, execution-only services (by Swiss-based companies) are also treated much more leniently than advice. So even if IB were Swiss (they aren’t), execution-only services still wouldn’t at risk.