I tried [] or [()] data binding first but it did not work. Created an ugly solution. You may need to ask ng-lighting why data binding does not work in column template.

Here is the Plunker: https://plnkr.co/edit/zNrWb4Ui2LVXc5fJb1oY?p=preview

Code I added:

<ngl-datatable-column heading="" key="points">
    <template nglDatatableHeading><input type="checkbox" (click)="toggleCheckAll()" /></template>
    <template nglDatatableCell><input type="checkbox" class="child-chkbox" /></template>
</ngl-datatable-column>

toggleCheckAll(){
    var chkboxes = document.getElementsByClassName('child-chkbox');
    this.checkAll = !this.checkAll;

    for(let i = 0; i < chkboxes.length; i++){
        chkboxes[i].checked = this.checkAll;
    }
}