
Old hat and legal nonsense
The Pebble 2 / Time 2 smartwatches incorporated heart monitoring & they were released on Kickstarter in May 2016, a while before Apple incorporated heart rate in their watches.
There is nothing truly original that I can see from a quick look through the main patent claims, just a compilation of existing ideas from other devices or systems.
One of the fundamental requirements of a truly valid patent was originally that to be patentable at all, the ideas or concepts in the patent had to be something significantly beyond a simple step in progress that a "competent engineer in the field" (or something along those lines) would likely be able to produce.
Miniaturising and combining existing devices concepts as technology advances is just linear progress, not the technological leap beyond that which a patent was supposed to protect.
Patents now appear to have become simply an anti-competition tool for big business to tie up or hold back its competitors by legal action and ludicrous expenses, rather than anything to do with genuinely new and original ideas.