The descriptions on the following points for Disintegrate don’t match, but they all have the same effect. The mismatched descriptions lead me to believe Inferno acted differently. Please change the Inferno talent to behave as described, or fix the description.
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But in LE every node within a skill spec tree does only interact with the skill itself, if not specificly stated otherwise.
I see your point, however it references the underlined effect “Immolation Aura”.
There are other underlined effects, such as Fire Aura, that are affected by multiple skills. Getting Fire Aura from Ignivar’s Head will be lightning element if you have Flame Wards’ talent of Lightning Ward.