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Not a question, just my version of the answer.

There were bugs in my code so I followed along with the video until I got it to work

Instead of looping and running an if statement for each space in the column I filtered to find all the nulls. Next I ran an if to see if the array was empty. Then selected the last items in the array by subtracting 1 from the length.

    playToken () {

        let spaces = this.board.spaces;
        let activeToken = this.activePlayer.activeToken;
        let targetColumn = spaces[activeToken.columnLocation];
        let targetSpace = null;

        let openSpaces = targetColumn.filter(spaces => spaces.token === null);
        if (openSpaces.length > 0) {
            let targetSpace = openSpaces[openSpaces.length - 1];
            this.ready = false;

If you want to give feedback, cool!