Even though Venom 2 will have an exclusive theatrical release, the door is still open for the movie to end up on Video-On-Demand after its initial run. This is entirely dependent on how well the movie does in theaters but it could get an early release on Digital or VOD.
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Sony Pictures, the movie’s distributor, has previously released some of their 2021 films via Premium Video-On-Demand (PVOD) after a few weeks in theaters. The Forever Purge, for example, was out on PVOD within a month of its theatrical premiere. It is possible that something similar could happen with Candyman but right now, this is still speculation, and nothing is set in stone. So for the time being, you will have to head out of your home to watch the movie.