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Overcharging a battery will boil it dry if done for extended periods. Been there, done that.
As to whether this charger will, I can't say. Personally, I don't think the miniscule potential savings are worth the risk.
My suggestion would be to run an extension from the charger you already have. Zip tie it to the extension cord you use for the block heater. run a cable from the battery to the block heater plug in. This way, you use the already proven charger and you are not dragging a questionable charger along that would have to live in a hostile environment it wasn't designed for.
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