[6] At the South Africa National Swimming Championships in April 2022, Coetze swam a time of 53.96 seconds in the 100 metre backstroke in the prelims heats, achieving a qualifying time for both the 2022 Commonwealth Games and 2022 World Aquatics Championships before going on to win the gold medal and national title in the final.

[11] On the sixth and final day of competition, he attained a fourth qualification in a time trial, swimming a 1:56.92 in the 200 metre backstroke.

[20] Later in the same session, he placed sixteenth in the prelims heats of the 100 metre freestyle, qualifying for the semifinals before withdrawing from further competition in the event.

[22] In the final, he finished 0.12 seconds behind gold medalist Andrew Jeffcoat of New Zealand with a 24.77 to win the silver medal.

[30] On 28 June, Coetze was named to the official South Africa roster for the 2022 FINA World Junior Swimming Championships, held in August and September in Lima, Peru.

[34][35][36] For the final of the 4×100 metre freestyle relay, he equalled his lead-off time of 49.75 seconds from the preliminaries, helping achieve a sixth-place finish in 3:24.09.

[43] For his second morning event, he swam a 49.85 for the lead-off leg of the 4×100 metre mixed freestyle relay, helping qualify for the final ranking fourth with a time of 3:36.82.

[44] In the evening, he ranked first in the semifinals of the 50 metre backstroke with a personal best time of 24.58 seconds, breaking the former Championships record of 24.63 established in 2017 by Michael Andrew of the United States, and advancing to the final.

[36][49][50] In the preliminaries of his eighth event of the Championships, the 100 metre freestyle, on day five, Coetze tied for fourth rank overall with a time of 50.09, which was 1.42 seconds behind first-ranked Diogo Ribeiro of Portugal and qualified him for the semifinals.

[36][57] For his first event in the morning session on day one of the 2022 World Short Course Championships in Melbourne, Australia, Coetze ranked ninth in the preliminary heats of the 100 metre backstroke with a personal best time of 50.26 seconds and qualified for the semifinals.

[68][69] On the evening of day four, he set a new African record in the final of the 50 metre backstroke with a personal best time of 22.84 seconds, with which he took fifth place.

[80][81] On the fifth and final day, Coetze achieved a time of 24.28 seconds in the 50 metre butterfly preliminaries before withdrawing from further competition in the event.

[82] In the evening, he won the gold medal and national title in the 200 metre backstroke with a World Championships qualifying time of 1:56.66.