My thinking and feeling was, there needs to be awareness first, the idea and concept and benefits of gratitude being spread pulling people in – rather than pushing something on them that might feel artificial. Having people reflect on what gratitude means for them, maybe that it has been a powerful part of life ever since and what potential there may be if you extend it.
So I could see this kind of initiative foster personal, individual awareness first and nudge thinking about areas, aspects, things, people to be grateful for. And ultimately, after reflection, potentially express this gratitude towards people explicitly. Like an experiment, a little playful maybe. Each individual can decide when and how to practice gratitude. And it does not even have to be "verbally expressed" towards another person. Gratitude is an attitude, that radiates your being and impacts both your own and others energy field and thus work culture and experiences.
So I think it fosters an energy shift and with it a new culture, in a "non structured" (and potentially less measurable) way, that invites everybody in and will have the chance to grow organically and sustainably. There are no expectations attached, requirements for people to behave in a certain way.
And yes, the link you attached speak directly to it. Especially the aspect of really truly becoming aware. It is a reflective, meditative state. Yet, I personally feel that it is not only bound to the relationship with people, but also strengthening the relationship with oneself, other beings and the world. Feeling grateful for having a job, for working in a beautiful building, even for a challenging encounter that made you grow (and maybe sharing this story with another, or with your higher self or the divine), to me, has true authentic power to change.