Also to be considered is the unit cost of Y20BE. We don't know what is the exact unit price, but referring to C-17's unit cost of around USD 340 million each, even if assuming Y20 cost is about half of C-17, it still is an expensive item of US$170 million per unit.
Not saying that no foreign countries would buy Y20 export variant, but they have to consider the needs of a startegic air lifter and prepare their budgets for such acquisition. So the talks of buying Y20 export variant by foreign customers might not happen so soon.
Countries that operate IL-76 with expiring airframe times would be potential customers, they may consider whether to buy Chinese or Russian transporter. If Russian have problem with delivery then Y20 export variant will be a better choice for the potential buyer. (PLAAF did had delivery problem with IL-76 purchases decades ago, but that is old story).