Does not appear to work with Gulp v4.0.2

[cyberjetx]

Since moving to gulp v4 I have not been able to use imagemin.

environment: windows cmd
gulp -v CLI version: 2.3.0 & Local version: 4.0.2

The closest I have gotten is this:
...
let /** @type {import("gulp-imagemin")} / imagemin;
let /* @type {import("imagemin-jpegtran")} / imageminJpegtran;
let /* @type {import("imagemin-pngquant").default} */ imageminPngquant;

const startup = async () => {
// @ts-ignore
imagemin = (await import("gulp-imagemin")).default;
// @ts-ignore
imageminJpegtran = (await import("imagemin-jpegtran")).default;
imageminPngquant = (await import("imagemin-pngquant")).default;
};

// run this task before any that require imagemin
gulp.task("startup", async () => {
await startup();
});
gulp.task('imageminx', function(done) {
startup;
return gulp.src('./src/images/.')
.pipe(imagemin())
.pipe(gulp.dest('./dist/images/'));
});
...

which, sadly, still reports error:
C:\Source\gulptests>gulp imageminx
[15:41:22] Using gulpfile C:\Source\gulptests\gulpfile.js
[15:41:22] Starting 'imageminx'...
[15:41:22] 'imageminx' errored after 13 ms
[15:41:22] TypeError: imagemin is not a function
at \Mac\Home\Documents\Source\gulptests\gulpfile.js:44:11
at taskWrapper (\Mac\Home\Documents\Source\gulptests\node_modules\undertaker\lib\set-task.js:13:15)
at bound (node:domain:421:15)
at runBound (node:domain:432:12)
at asyncRunner (\Mac\Home\Documents\Source\gulptests\node_modules\async-done\index.js:55:18)
at processTicksAndRejections (node:internal/process/task_queues:78:11)

If I am missing something I apologize for the ticket.