Orwell himself was a left anarchist and staunch antifascist and anticapitalist. His critique is that of authoritarianism. If you take away from Orwell that he supports capitalism in any form then you may have missed his point.
Everything goes to pot when the Stalin-analogue takes over, because the book is a reflection of Orwell's opinions of the Soviet Union and his experience fighting with the communes in Spain and the subsequent purges committed Stalinist factions against the Trotskyists. If you read the Ukranian prologue, which is included with most modern published editions, Orwell even outlines that Animal Farm is an attack on Stalinism, and he firmly believes in socialism.
"Only conscious organisation of social production, in which production and distribution are carried on in a planned way, can lift mankind above the rest of the animal world as regards the social aspect, in the same way that production in general has done this for men in their aspect as species. Historical evolution makes such an organisation daily more indispensable, but also with every day more possible."
"If it should become necessary for communist society to regulate the production of men, just as it will have already regulated the production of things, then it, and it alone, will be able to do this without difficulties. It seems to me that it should not be too difficult for such a society to achieve in a planned way what has already come about naturally, without planning, in France and Lower Austria. In any case it will be for those people to decide if, when and what they want to do about it, and what means to employ"
That's why, in the transition period, power would end up concentrated in the hands of a small group of people.
Obviously eventually the idea was that the State would cease to be anything more than a mechanism for distribution of resources and stop managing people, but there are an awful lot of problems with that, conceptually.
Also, the guy I responded to said it didn't have to involve central planning. It kinda does, at least Marx and Engel's version does.
Read the book Animal Farm if you haven’t already. That captures the psychology of communism perfectly and demonstrates why it never, ever works.