I invite you to read the decision itself (https://www.canlii.org/en/sk/skkb/doc/2023/2023skkb116/2023s...), rather than rely on mass-media summaries. In this case, the court does not in fact decide that a thumbs-up emoji always means something. Instead, it considers the parties' histories to note that prior contracts between them were often approved with a simple 'ok,' 'yup', or 'looks good'. The parties did not have a history of initially confirming receipt of a proposed contract and then later negotiating terms or having a separate signing.

In that very specific context, the court found that thumbs-up emoji was a short approval much like 'yup'; see paragraphs 21 and 34-36 of the decision.