The debuffs would be treated separately rather that stacking I think, which is actually better.
Nihilus has 100k health for easy maths. In your four debuffs scenario it would go:
100,000 x 1.3 = 130,000
130,000 x 1.3 = 169,000
169,000 x 1.3 = 219,700
219,700 x 1.3 = 285,610 max health.
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Nihilus has 100k health for easy maths. In your four debuffs scenario it would go:
100,000 x 1.3 = 130,000
130,000 x 1.3 = 169,000
169,000 x 1.3 = 219,700
219,700 x 1.3 = 285,610 max health.
Rather than 100,000 x 2.2 = 220,000 max health.