Correct, the platform was shared between the tenth generation (2014-2020) Impala and last generation LaCrosse (2010-2016). From the article you shared:
"Like all tenth-generation units of the Chevrolet Impala, the 2019 Impala continues to ride on a long-wheelbase variant of the
GM Epsilon II platform called Super Epsilon. The architecture is shared with the second-generation
Buick LaCrosse and first-generation
Cadillac XTS. A short wheelbase of the Epsilon architecture underpinned the eighth-generation
Chevrolet Malibu and fifth-generation
Buick Regal."
The newest, third generation, LaCrosse moved to the E2XX platform and the Impala continued to ride out the Epsilon II platform until retirement.