Shilao also said in the stream to consider this is a ship that has maybe 100 TEU capacity. Consider if you scale this same concept to one of those giant 20,000 TEU container ship, how big of an arsenal ship that would be.
Though, given how TEU containers are stacked on top of one another on container ships - Sheer volume doesn't really reflect much compared to the top surface area (i.e. number of container slots available in a 2D-plane) that is available for use, considering that all the VLS tubes, CIWS, radar & sensor systems and decoy launchers must be placed on the top of their respective TEU container stacks to enable operations.
Of course, more TEU capacity also means more power banks can be carried by the ship, which directly determines how long the employed systems on said ship can function.
I think the more important factor for consideration with such setups would be the
absolute sheer number of platforms that have been made available for use by the PLAN in a wider/all-out war scenario, such that the proper warships of the PLAN can be made available for more pressing missions and/or locations.
Do container ships go faster if they are lightly loaded? Curious if it can break 20 knots.
Container ships typically can sail between 16-25 knots, though they most often sail in the lower-end/lower-half range of speeds for fuel efficiency (if not even lower in some cases).
There are also fast container ships that can sail very fast, such as the Mearsk B-class ships with ~4200 TEUs that can cruise at 29 knots and at speed of up to 37 knots. However, they are more expensive to operate, and they are only available in significantly low numbers.