Ok I read some of the article and it seems like mental masturbation to me. They are so stupidly overpowered they don't make for good narrative. I personally wouldn't combine them with guyver, as guyver is fairly well written.
If one of them was pitted against the guyver, they would crush guyver in an instant. guyver has been seen to react fast, but it's physical movement speed is limited. also, a guyver's strength is 100 times that of a human whereas these living statues are 1000 times stronger than a human. one of them, vs a guyver, is like looking at guyver vs ramotith.
There's no indication that the physical strength of a gigantic is increased by any great amount, but it has the barrier, and it has more powerful weaponry. I didn't read any part in the article that indicated the 'venom' is particularly corrosive. zerbebuth's corrosives are insane, able to melt through cement and steel if I remember correctly. it was harmful to guyver but not by too much. In the tv series, it was shown to melt the guyvers high frequency sword but I think that was wrong because otherwise they would have used that for all the enzyme type zoanoids instead of the disassembly ezyme. I believe the gigantic could dismember one of them , but it might be difficult. But the head beam at full power has been known to vaporise concrete, so I think that would work.
I think it may be useful to compare one of those walking statues to a zoalord. I think that is the right sort of level to put them at.