Mikael Åkerfeldt's English flubs

transfixed said:-

I think if it was gild it would make sense because the definition of gild could apply to something a shadow does in a poetic sense...

"
2. To make attractive; to adorn; to brighten.

3. To give a fair but deceptive outward appearance to; to embellish; as, to gild a lie. --Shak.
"

This makes perfect sense. I'm sure that there was a mistype in the booklet.