Earlier quoted context omitted.
There's no reason to think it would have produced better results than a free market economy.
There are dozens of reasons. Free markets have deduplication of labour, concepts like patents and IP that are inefficient are necessary, there are economic crises that wreck compound growth in the long term, there are issues of inequality, humans may be lazy and not attempt to allocate their capital in the most appropriate way (see index funds), socially useful endeavors may not be profitable, etc... But central plan…
There's no reason to think that economic crises and inequality would be absent in a planned economy.