An asset class is a group of instruments that behave alike: currencies, metals, indices, energy, crypto, stocks. Regulators such as FINRA describe spreading capital across several classes as the basic form of diversification, because the classes do not move together. Gold can rally while the Nasdaq falls; oil can spike while currencies barely notice.
On Javlot the Multi-asset tag is not a claim, it is a measurement. Every strategy's asset class is derived from its actual trade history. A strategy whose positions have only ever been on gold is tagged Gold. The moment its history spans more than one class, the tag becomes Multi-asset, and it stays there: the classification only ever widens, it never quietly narrows back to whichever market the latest trades happened to be on.
What the tag tells you is that the equity curve is a blend. The drawdown of a multi-asset strategy comes from the worst combination of its markets, not from one of them, and its results should be read as a portfolio rather than as a bet on a single instrument. Whether that blend is a strength depends on how correlated the markets are in a stress, which is precisely when correlations tend to rise.
The trade history on the detail page lists the instruments actually traded, so the tag can always be opened up to see what the blend is made of.