This is certainly true, but it’s also just a fancy way of saying ‘ETF’ or ‘a few ETFs’. That it costs anything to do this other than the underlying costs of each fund is the problem. If you aren’t sure what to invest in, you’re better off paying someone once (or periodically to rebalance) to help you decide the relevant ETFs to invest in and target them in the cheapest form possible (e.g. Freetrade, but I’m biased). Good, free information is also available online but clearly this won’t be personalised to your circumstances.
The legitimisation of paying % ongoing fees for the privilege of accessing pre-existing ETFs is one of the most damaging trends of the last couple of years and reflects badly on fintech!