Questions about Lindy Adapter Toslink to Mini-Optical 3.5mm jack

Do I understand this correctly: If I plug this adapter into the Swisscom TV Box (thus mini-optical to Toslink), then plug the "Sonos Optical Audio Adapter" onto it (thus Toslink to HDMI) and connect an HDMI cable to it, can I connect a SONOS Arc and use the HDMI output of the Swisscom TV Box to connect my beamer?

Does the following work? I plug a Toslink cable into the Playstation4 output, connect the cable to my normal PC speakers (just two boxes, no subwoofer or anything) with a normal audio connection (i.e. a light green connection), then plug this adapter (Lindy Adapter Toslink to Mini-Optical 3.5mm jack) into the normal Toslink cable and poof, I can plug this into the PC speakers and I have the sound from the Playstation4 on my speakers and have normal good sound? Is it that simple? That would be great.