You may not be aware about ASX rules on continuous disclosure:...

You may not be aware about ASX rules on continuous disclosure:

3.1 Once an entity is or becomes aware of any information concerning it that a reasonable person would expect to have a material effect on the price or value of the entity’s securities, the entity must immediately tell ASX that information.

So, MSB is covering its legal requirements in making the announcement. Clearly, the company believes the announcement has a material effect on its VALUE, even if the price hasn't responded to the announcement.

If a company does not issue information it believes is material, it also opens itself up to shareholder class actions. In this case, if the shares start to rise in the near-term due to non-disclosed information leaking out to some buyers, those holders who sold could sue for the loss of value and they would argue that had they known the information they would've demanded a higher price, or not sold at all.

Disclosure is simply good corporate practice.