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Christiansen's equations were used for that study, which are pretty inaccurate for P. tigris, due to both interspecific trends and the light specimens.
For example, I'll release a specimen from AMNH I've on record. You can find it in Sorkin 2008, AMNH 113744, FL = 396.5. This was a wild P. t. tigris, and weighed 236 kg. Here's the official scan of his sheet and source (look on the bottom right):
*This image is copyright of its original author
Use C&H's equation here and we get 173 kg (L. lynx included) and 179 kg (L. lynx removed). PE = 24%. The large bones are far out of the size range of the chart, and PE would be even greater there due to the negative allometry of the line.