The Whale Swallowing Technique sounded quite cool from the name.
However, the technique did nothing else except for strengthening one's teeth, stomach, and digestive system.
Moreover, the Whale Swallowing Technique didn't even allow one to eat everything. It only allowed the user to eat one thing… spirit beast crystals.
Song Shuhang understood it as soon as he learned the technique. The Whale Swallowing Technique was the supplementary technique of the Huge Whale Chapter to merge the pseudo-innate true qi inside his body.
After eating the spirit beast crystals, the embryonic form of pseudo-innate true qi inside his body would merge with the origin true qi of the thirty-three spirit beasts, giving birth to a type of 'origin true qi' that was infinitely close to real 'innate true qi'.