If there's any danger, its from the billions of cubic meters under the ocean floor (the source of the nodules, seeping from underneath). More carbon than all the oil we ever burned in our civilization so far.
Is that in any danger of accelerated release? I've not heard of that.
In the long-term, yes, it will eventually reach a steady state. In the long term, though, we'll all be dead.
In the short-term, on timescales that human beings care about, no, we can release too much of it too quickly, before the system reaches a steady equilibrium. Methane has an atmospheric half-life measured in decades, so getting too much of it, too fast, can significantly spike temperatures.
> For the second year in a row, his team have found crater-like pockmarks in the shallower parts of the Laptev Sea and East Siberian Sea that are discharging bubble jets of methane, which is reaching the sea surface at levels tens to hundreds of times higher than normal.
https://www.theguardian.com/science/2020/oct/27/sleeping-gia...