The Steel were able to improve from their previous campaign after snatching their ninth win on September 17, surpassing their 7–18 record in win percentage. They would then win 11 of the remaining 13 games to finish the season 20–10 and finish as the third seed in the South Division.
Their playoff run began with a sweep against Iloilo followed by a 2–1 series victory over Bacoor City.[1][2] In the division finals against the Davao Occidental Tigers, Basilan would win game 1 against the reigning division champions on opposing grounds before the Tigers tied the series in game 2. Following the one-year suspension due to the COVID-19 pandemic, game 3 was originally scheduled for March 10, 2021, but was postponed by a week due to a player being tested positive for the virus.[3] By March 17, multiple members of the Basilan team had also been tested positive, thus the league decided to rule them out of the series, abruptly ending their season.[4] Davao Occidental would eventually become champions in the national finals. Following the controversial ruling, the team moved to the Pilipinas VisMin Super Cup in 2021, then the Pilipinas Super League in 2022 before ultimately returning to the MPBL in 2025.
All of the team's home games this season were played at the Lamitan Capitol Gymnasium in Lamitan.
Source: Standings Rules for classification: 1) Wins; 2a) If two teams are tied, head-to-head match-up; 2b) If three or more teams are tied, head-to-head point quotient; 3) overall point quotient; 4) coin toss. Notes:
^Zamboanga (1.071), Iloilo (0.976), and General Santos (0.960) are ranked based on head-to-head point quotient.
^Originally, scheduled for March 17, 2021, Davao Occidental won the game by default due to multiple Basilan Steel members being tested positive for COVID-19.