You provided one source which also lists the Thurston and Sloan quotes as a dissenting opinions to the rest of the article. The Wikipedia article itself states that worker councils lost both their power and ability to vote followed by protests by workers which were violently put down.
Why do I need to provide more sources when the one you provided almost fully agrees with my statement with the exception of one dissenting historian?
You know the anarchist group I'm part of had people like you join from time to time that seem more interested in reading, purity testing and just calling other members "bad lefties" instead of taking part in local politics which is our main goal. Calling me unserious while complaining about definitions takes the cake though.
You seem to have misread it more. Yes, parties were banned but so were factions in the bolshevik party, elected city soviets and pretty much all groups outside the party. Meaningful elections happened only inside the party, the elections everyone took part in were for show, they gave no control to the workers. It's all in that source.
If you are interested in how elections were run in the USSR this is pretty much how I remember: https://en.m.wikipedia.org/wiki/Elections_in_the_Soviet_Union From what I remember the candidates you could actually vote for were party picks that would do the same thing anyways so your vote was merely symbolic. Over time people cought on to that and voter turnout crashed so hard the party started handing out exotic fruit to people who show up, I got my first orange that way.
If you want to know what happened to the worker councils in the USSR read it here: https://en.m.wikipedia.org/wiki/Workers%27_council
Pat Sloan probably took part in an election before Stalin, as I previously said, the election process after Lenin was very different. So, yea one dissenting historian.