Yes, the way the walkthrough is written is very explicit, instead of just giving you hints and directions, it tells you everything that is going to happen down to the lines. As for me, it took me four playthroughs to finish the game (restarted or lost my saves) but the plot for me was just an excuse for the lewd. But I understand that by using the walkthrough, it can ruin the pleasure of discovery and what comes next.
What you might do to minimize this, is to play the game in versions order. Just do everything the walkthrough tell you for each version, then delete that block line and go on. Like I said you won't be penalized for skipping 3, 5, 7, 10, hell 20 days if you have to. But at the same time, you might stumble upon some scenes that are not currently in the version you are following so I don't think there's a proper way to avoid spoilers unless like you said above, someone mod an in-game walkthrough (which will likely never happen, I don't have the skills to do that but I would if I had them). I understand your frustration, we all consume our games in a way that we see fit.
May I suggest you to try their current game, Seaside Mystery? It's a different story in a very similar setting but with a lot of improvements and the hint system work in a way where you won't ever need to follow a walkthrough (at least, I can affirm that for the current version). Some girls from The Twist as well as new ones are in the game, you might miss on some references but that is not really revelant. As a fan of The Twist, I can't wait for the game to be fully released.