Those commands still work on Pi4 family and earlier. Pi5 does not have a relocatable heap, so the vcgencmd was never implemented for Pi5.

Pi4

pi@pi4$ vcgencmd commands
commands="commands, set_logging, bootloader_config, bootloader_version, cache_flush, codec_enabled, get_mem, get_rsts, measure_clock, measure_temp, measure_volts, get_hvs_asserts, get_config, get_throttled, pmicrd, pmicwr, read_ring_osc, version, readmr, otp_dump, set_vll_dir, set_backlight, get_lcd_info, arbiter, test_result, get_camera, enable_clock, scaling_kernel, scaling_sharpness, hdmi_ntsc_freqs, hdmi_adjust_clock, hdmi_status_show, hvs_update_fields, pwm_speedup, force_audio, hdmi_stream_channels, hdmi_channel_map, display_power, memtest, dispmanx_list, schmoo, render_bar, disk_notify, inuse_notify, sus_suspend, sus_status, sus_is_enabled, sus_stop_test_thread, egl_platform_switch, mem_validate, mem_oom, mem_reloc_stats, hdmi_cvt, hdmi_timings, file, vcos, ap_output_control, ap_output_post_processing, vchi_test_init, vchi_test_exit, pm_set_policy, pm_get_status, pm_show_stats, pm_start_logging, pm_stop_logging, vctest_memmap, vctest_start, vctest_stop, vctest_set, vctest_get"

pi@pi5:~ $ vcgencmd commands
commands="commands, set_logging, bootloader_config, bootloader_version, cache_flush, codec_enabled, get_mem, get_rsts, measure_clock, measure_temp, measure_volts, get_hvs_asserts, get_config, get_throttled, pmicrd, pmicwr, read_ring_osc, version, readmr, otp_dump, pmic_read_adc, power_monitor"

vcgencmd mem_reloc_status: "Command not registered" #137

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